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This is a list of states in the Holy Roman Empire beginning with the letter B:
| Name | Type | Imperial circle | Imperial diet | History | |
|---|---|---|---|---|---|
 Baar | Landgraviate | Swab | 763: Gau county Bertholdsbaar 1070: To Sulz 1282: Sold to Austria 1283: To Fürstenberg 1806: To Baden | ||
 Babenhausen | Lordship 1803: Principality | n/a | n/a | 12th Century: To Schönegg as fief of Tübingen 1378: Sold to Rechberg-Staufeneck 1432: To Rechberg-Babenhausen 1507: To Rechberg-Brandenburg 1537: To Rechberg-Kellmünz 1539: Sold to Fugger 1560: To Fugger-Wöllenburg 1598: To Fugger-Babenhausen 1803: HRE Prince 1806: To Bavaria | |
 Baden | Margraviate | Swab | the 4 below | c. 960 1190: Partitioned into Baden-Baden and Baden-Hachberg 1771: Reunited by Baden-Durlach 1803: HRE Elector 1806: Joined Confederation of the Rhine as a Grand Duchy | |
| Baden-Baden | Margraviate | Swab | PR | 1190: Partitioned from Baden 1291: Partitioned into itself, Baden-Eberstein and Baden-Pforzheim 1335: Extinct; divided between Baden-Eberstein and Baden-Pforzheim 1348: Partitioned from Baden-Pforzheim 1515: Partitioned into itself, Baden-Durlach and Baden-Sponheim 1536: Partitioned into itself and Baden-Rodemachern 1588: Extinct; to Baden-Rodemachern 1622: Partitioned from Baden-Durlach 1771: Extinct; to Baden-Durlach | |
| Baden-Durlach | Margraviate | Swab | PR | 1515: Partitioned from Baden-Baden 1577: Partitioned into itself, Baden-Hachberg and Baden-Sausenburg 1771: Renamed to Baden | |
| Baden-Eberstein | County | Swab | SC | 1291: Partitioned from Baden-Baden 1353: Extinct; to Baden-Pforzheim | |
| Baden-Hachberg (Baden-Hochberg) | Margraviate | Swab | PR | 1190: Partitioned from Baden 1290: Partitioned into itself and Baden-Sausenburg 1415: Extinct; to Baden-Baden 1482: Partitioned from Baden-Baden 1488: Extinct; to Baden-Baden 1577: Partitioned from Baden-Durlach 1591: Extinct; to Baden-Durlach | |
| Baden-Pforzheim | Margraviate | n/a | n/a | 1291: Partitioned from Baden-Baden 1315: Partitioned into itself and Baden-Baden 1361: Extinct; to Baden-Baden | |
| Baden-Rodemachern | Margraviate | n/a | n/a | 1537: Partitioned from Baden-Baden as fief of Luxembourg 1575: Partitioned into itself and Baden-Rodenheim 1596: Extinct; to Baden-Durlach 1622: Partitioned from Baden-Durlach 1666: Extinct; to Baden-Baden | |
| Baden-Rodenheim | Margraviate | n/a | n/a | 1575: Partitioned from Baden-Rodemachern 1620: Extinct; to Baden-Durlach | |
| Baden-Sausenberg | Margraviate | n/a | n/a | 1290: Partitioned from Baden-Hachberg 1503: Extinct; to Baden-Baden 1577: Partitioned from Baden-Durlach 1604: Extinct; to Baden-Durlach | |
| Baden-Sponheim | Margraviate | n/a | n/a | 1515: Partitioned from Baden-Baden 1533: Extinct; to Baden-Baden | |
 Badenweiler | Lordship | n/a | n/a | 1028: First mentioned, property of the Zähringen 1147: To Saxony 11??: To Swabia 1268: To Freiburg 1272: Partitioned from Freiburg 1303: Extinct; to Strasberg 1385: To Freiburg 1444: To Baden-Sausenberg 1503: Inherited by Baden-Baden | |
 Baindt | Abbacy | Swab | SP | 1240: Abbey established 1376: Imperial immediacy; HRE Princess 1802: Secularised to Leyden 1803: To Aspremont-Lynden 1806: To Württemberg | |
 Bamberg | Bishopric | Franc | EC | 1007: Diocese established c. 1242: HRE Prince of the Empire 1802: To Bavaria | |
 Bar (Bar-le-Duc; Barrois; Mass; Meuse) | County 1354: Duchy | Upp Rhen | PR | 959: To Lorraine (Upper Lotharingia) 1033: Partitioned from Lorraine 1301: Western half made fief of France 1354: Duke in France; HRE Margrave 1506: In personal union with Lorraine 1634-1659, 1670–1697, 1702–1714: To France 1766: To France permanently | |
 Barby | Lordship 1497: County | Upp Sax | WT | 974: To Quedlinburg Abbey 12th Century: To Arnstein 1226: Partitioned from Arnstein 1497: HRE Count 1565: Partitioned into Barby-Barby and Barby-Mühlingen 1651: Reunited by Barby-Mühlingen 1659: Extinct; to Saxony | |
| Barby-Barby | County | Upp Sax | WT | 1565: Partitioned from Barby 1651: Extinct; to Barby-Mühlingen | |
| Barby-Mühlingen | County | Upp Sax | WT | 1565: Partitioned from Barby 1651: Renamed to Barby | |
 Barmstedt (Barmstede) | Lordship | n/a | n/a | 1149: First mentioned c. 1375: Extinct; to Holstein-Schaumburg 1640: To Schleswig-Holstein-Gottorp 1649: Sold to Rantzau 1721: To Denmark | |
 Basel | Bishopric | Upp Rhen | EC | c. 740: Diocese established 999: Acquired immediate territory 1032: HRE Prince of the Empire 1579: Allied to the Swiss Confederation 1792: Left-bank territories annexed to the Rauracian Republic 1803: Right-bank territories secularised and ceded to Baden | |
 Basel | Imperial City | n/a | n/a | 1392: Acquired semi-independence; Free Imperial City 1501: Joined the Swiss Confederation 1648: Left the Empire as part of Switzerland | |
 Bassenheim | Lordship 1729: Barony | Originally to Isenburg-Braunsberg as fief of Cologne 13th Century: To Waldbott von Waltmannshausen as fief of Cologne 1337: To Waldbott von Bassenheim as fief of Cologne 1729: Imperial immediacy; HRE Baron 1794: To France 1815: To Prussia | |||
 Battenburg | County | n/a | n/a | 1101: First mentioned 1238: Partitioned into itself and Wittgenstein 1291: Half sold to Mainz 1296: Remainder sold to Mainz 1310: Extinct 1464: Sold to Hesse | |
 Baumburg (Baumberg; Naumburg) | Raugraviate | n/a | n/a | c. 1148: Partitioned from the Wildgraviate 1172: Partitioned into Stolzenberg and itself 1253: Partitioned into Neuenbaumburg and Altenbaumburg | |
 Bavaria (Bayern) | Duchy 1623: Electorate 1806: Kingdom | Bav | EL | c. 520: First mentioned 1185: Acquired the Burgraviate of Regensburg 1214: Acquired the County Palatine of the Rhine 1255: Partitioned into Upper and Lower Bavaria 1340: Reunited by Upper Bavaria 1349: Partitioned into Brandenburg, Upper Bavaria and Lower Bavaria 1505: Reunited by Bavaria-Munich 1545: Bavaria reunited after many divisions 1623: HRE Elector; Acquired Upper Palatinate 1646: Side line Bavaria-Leuchtenberg founded 1806: Joined the Confederation of the Rhine as Kingdom | |
| Bavaria-Dachau | Duchy | Bav | PR | 1467: Partitioned from Bavaria-Munich 1501: Extinct; to Bavaria-Munich | |
| Bavaria-Haag | Duchy | Bav | PR | 1650: Created when Albert VI of Bavaria-Leuchtenberg acquired Haag 1666: Extinct; to Bavaria | |
| Bavaria-Ingolstadt | Duchy | n/a | n/a | 1392: Partitioned from Bavaria-Landshut 1445: Extinct; to Bavaria-Landshut | |
| Bavaria-Landshut | Duchy | Bav | PR | 1353: Partitioned from Lower Bavaria 1392: Partitioned into Bavaria-Ingolstadt, Bavaria-Landshut and Bavaria-Munich 1503: Extinct; succession dispute between Bavaria-Munich and Palatinate-Neuburg 1505: Annexed to Bavaria-Munich | |
| Bavaria-Leuchtenberg | Duchy | Bav | PR | 1646: Created when Albert VI of Bavaria acquired Leuchtenberg 1650: Exchanged with Maximilian to form Bavaria-Haag 1680: Extinct; to Bavaria | |
| Bavaria-Munich | Duchy | n/a | n/a | 1392: Partitioned from Bavaria-Landshut 1467: Partitioned into Bavaria-Munich and Bavaria-Dachau 1505: Became D. of Bavaria | |
| Bavaria-Straubing | Duchy | Bav | PR | 1353: Partitioned from Lower Bavaria 1425: Extinct; divided between Bavaria-Ingolstadt, Bavaria-Landshut and Bavaria-Munich | |
 Beckenried | Abbacy | Swab | SP | 1521: Identified in the Reichsmatrikel 1521 as an Imperial Abbey, but the house has not been identified. Assumed to be at Beckenried, Nidwalden | |
 Beichlingen | Lordship | Upp Sax | WE | 1014: First mentioned 1275: Partitioned into Beichlingen-Beichlingen and Beichlingen-Rothenburg 1360: Reunited by Beichlingen-Beichlingen 1519: Sold Beichlingen to Werthern; remaining territories as fief to Saxony 1567: Extinct | |
| Beichlingen-Beichlingen | Lordship | n/a | n/a | 1275: Partitioned from Beichlingen 1320: Partitioned into itself and Beichlingen-Sachsenfeld 1330: Sold Heringen to Hohnstein-Klettenberg 1360: Renamed to Beichlingen | |
| Beichlingen-Rothenburg | Lordship | n/a | n/a | 1275: Partitioned from Beichlingen 1360: Extinct | |
| Beichlingen-Sachsenfeld | Lordship | n/a | n/a | 1275: Partitioned from Beichlingen-Beichlingen 1345: Extinct; to Beichlingen-Beichlingen | |
 Beilstein | Lordship 1679: County | El Rhen | WE | 1268: First mentioned; fief of Cologne 1361: Extinct 1363: To Winneburg as fief of Cologne 1637: To Metternich 1679: HRE Count 1794: To France 1815: To Prussia | |
 Bentheim Count of Bentheim, Tecklenburg, Steinfurt & Limburg, Lord of Rheda, Wevelinghoven, Hoya, Alpen, Helpenstein, Baron of Lennep, Hereditary Advocate of Cologne | Lordship 1530: County | Low Rhen | WE | 1050: First mentioned 1115: To Otto of Salm 1146: Made fief of Utrecht 1182: Imperial immediacy 1263: Acquired Tecklenburg 1279: Partitioned into Tecklenburg and Bentheim 1421: To Götterswyk who assumed the name Bentheim 1454: Partitioned into Bentheim-Steinfurt and Bentheim-Bentheim 1530: Reunited by Bentheim-Steinfurt 1606: Partitioned into Bentheim-Tecklenburg-Rheda, Bentheim-Steinfurt, and appanages Bentheim-Limburg and Bentheim-Alpen | |
 Bentheim and Steinfurt | County | Low Rhin | WE | 1804: Renamed from Bentheim-Steinfurt 1806: Bentheim to Berg, Steinfurt to Prussia | |
 Bentheim-Alpen | County | n/a | n/a | 1606: Appanage created in Bentheim-Steinfurt and Neuenahr 1629: Extinct; apanage abolished | |
 Bentheim-Bentheim | Lordship 1486: HRE Count | Low Rhin | WE | 1454: Partitioned from Bentheim 1486: HRE Count 1530: Extinct; to Bentheim-Steinfurt 1643: Partitioned from Bentheim-Steinfurt 1753: Mortgaged to Hanover 1803: To Bentheim-Steinfurt 1804: Extinct | |
| Bentheim-Limburg | County | n/a | n/a | 1606: Appanage created in Bentheim-Steinfurt and Neuenahr 1618: Extinct; to Bentheim-Alpen | |
 Bentheim-Steinfurt | Lordship 1486: County | Low Rhen | WE | 1454: Partitioned from Bentheim 1486: County 1530: Renamed to Bentheim 1606: Partitioned from Bentheim 1643: Partitioned into itself and Bentheim-Bentheim 1804: Renamed to Bentheim and Steinfurt | |
 Bentheim-Tecklenburg | Lordship | n/a | n/a | Name sometimes given to the County of Tecklenburg under the rule of the Bentheim 1277 - 1328 | |
 Bentheim-Tecklenburg-Rheda | County | Low Rhen | WE | 1606: Partitioned from Bentheim-Steinfurt 1696: Tecklenburg to Solms-Braunfels 1807: To Berg | |
 Bentinck HRE Count of Bentinck and Aldenburg, Lord of the free Lordship of Knyphausen, Noble Lord of Varel | Lordship 1732: County | n/a | n/a | 1343: First mentioned 1732: HRE Count 1738: Acquired Knyphausen and Varel 1810: To France 1814: To Oldenburg | |
 Berchtesgaden Prince, Provost and Lord of Berchtesgaden | Abbey 1491: Provostry | Bav | EC | 1108: Abbey established 1194: Imperial immediacy 1380: HRE Prince 1491: Converted to a Provostry 1559: Raised to Bench of Spiritual Princes 1803: To Salzburg 1805: To Austria 1809: To Bavaria | |
 Berg | County 1380: Duchy | Low Rhen | PR | 1077: First mentioned; branch of the Ezzonen 1160: Partitioned into itself and Berg-Altena 1218: To Limburg 1247: Partitioned from Limburg 1380: Duchy 1423: To Jülich-Berg 1521: To Jülich-Cleves-Berg 1609: War of the Jülich Succession between Brandenburg and Palatinate-Neuburg 1614: To Palatinate-Neuburg 1685: To the Palatinate 1777: To Bavaria 1806: To Berg 1815: To Prussia | |
 Berg-Altena | County | n/a | n/a | 1161: Partitioned from Berg 1180: Partitioned into Altena-Isenberg and Altena-Berg | |
 Bern (Berne) | Imperial City | n/a | n/a | 1218: Free Imperial City 1353: Joined the Swiss Confederation 1415: Acquired Aargau 1536: Acquired Vaud 1648: Left the Empire as part of Switzerland | |
 Besançon | Archbishopric | Upp Rhen | EC | 4th Century: Diocese established 1184: Acquired Besançon; imperial immediacy 1288: HRE Prince of the Empire 1493: Lost Besançon; retained seat in the Imperial Diet until 1803 1678: To France | |
 Besançon | Imperial City | Burg | n/a | 1290: Free Imperial City; semi-independent from the Archbishopric of Besançon 1493: Acquired complete independence 1648: To the Free County of Burgundy 1678: To France | |
 Biberach an der Riß | Imperial City | Swab | SW | 1281/2: Free Imperial City 1803: To Baden 1806: To Württemberg | |
 Biberbach | Lordship | n/a | n/a | 1279: Partitioned from Pappenheim 1514: Sold to Fugger 1624: Extinct | |
| Billung March (Billunger Mark) | Margraviate | n/a | n/a | 928: March established 983: Conquered by the Obotrites | |
 Bilstein in Franconia | County | n/a | n/a | c. 1130: Lordship founded by descendants of the Margraves of Zeitz 1301: Sold to Hesse 1306: Extinct | |
| Blankenburg | Abbacy | Low Rhen | RP | 1521: Identified in the Reichsmatrikel 1521 as an Imperial Abbey, but the house has not been identified | |
 Blankenburg | County (1123) 1707: Principality of Imperial immediacy | Low Sax | WE | 1123: First mentioned; fief of Saxony c. 1162: Partitioned into itself and Regenstein 1180: Fief of Halberstadt 1202: Fief of Brunswick and Lüneburg 1344: Fief of Halberstadt 1368: Extinct; to Regenstein-Blankenburg 1599: To Halberstadt 1624: To Max von Waldstein 1629: To John II of Merode 1631: To Brunswick-Wolfenbüttel 1642: To Tattenbach as fief of Halberstadt 1671: To Brunswick-Wolfenbüttel as fief of Halberstadt 1690: To Brunswick-Wolfenbüttel-Blankenburg as fief of Halberstadt 1707: Imperial immediacy; Bench of Counts of Westphalia 1731: In personal union with Brunswick-Wolfenbüttel 1805: Annexed to Brunswick-Wolfenbüttel 1807: To Westphalia 1814: To Brunswick | |
 Blankenheim | Lordship 1380: County | Low Rhen | WE | 1149: Partitioned from Schleiden 1406: Extinct; to Heinsberg by marriage 1469: To Manderscheid 1699: Imperial immediacy 1780: To Sternberg-Manderscheid 1794: To France 1815: To Prussia | |
 Blieskastel | County | n/a | n/a | 1125: Partitioned into itself and Saarwerden 1237: Extinct; to Salm 1284: To Finstingen 1337: To Trier 1660: To Leyen-Adendorf 1705: To Leyen-Hohengeroldseck 1793: To France 1814: To Bavaria | |
 Blumenegg | Lordship 1396: County | n/a | n/a | 1258: First mentioned; fief of Werdenberg-Sargans 1328: To Werdenberg-Vaduz 1391: To Brandis 1510: To Sulz 1613: To Weingarten Abbey 1803: To Nassau-Orange-Fulda 1804: Sold to Austria | |
 Bockstädt | County | n/a | n/a | 1231: Partitioned from Stolberg 1346: Extinct; to Hohnstein-Heldrungen | |
 Bohemia | Duchy 1198: Kingdom 1356: Elector | None | EL | 895: Joined the Empire as a Duchy 1029: Acquired Moravia 1198: HRE King 1356: HRE Elector | |
 Bonndorf | County | Swab | SC | Originally a property of Gurtweil, later of Küssaburg 1250: To Lupfen 1582: To Pappenheim 1609: To St Blaise's Abbey 1803: To Knights of St. John 1805: To Württemberg 1806: To Baden | |
 Boos | Lordship | n/a | n/a | 10th century: Originally a fief of Kempten Abbey held by the Lords of Boos 1176: To Ottobeuren Abbey 1551: Sold to Fugger 1693: To Fugger-Boos 1777: To Fugger-Babenhausen 1806: To Bavaria | |
 Bopfingen | Imperial City | Swab | SW | 1241: Free Imperial City 1802: To Bavaria 1810: To Württemberg | |
 Bouillon | County 1456: Duchy Mediated state through the PBL n/a | n/a | 959: First mentioned | 1095: Sold to the Prince-Bishopric of Liège 1456: Prince-Bishop of Liège assumed the title "Duke of Bouillon" 1482: To La Marck 1521: To the Prince-Bishopric of Liège 1552: To France, who bestowed it upon La Marck 1559: To the Prince-Bishopric of Liège 1676: To France 1678: Bestowed upon La Tour d'Auvergne as protectorate 1794: To France 1815: To Luxembourg 1830: To Belgium | |
 Brabant | Duchy | Burg | EC | 1085: Partitioned from Lower Lotharingia; given to Henry III of Louvain and Brussels Landgraviate 1183: HRE Duke 1288: Acquired Limburg 1430: To the Duchy of Burgundy 1477: To the Burgundian Netherlands 1516: To the Spanish Netherlands 1609: Northern Brabant to the Netherlands 1795: Southern Brabant to France 1815: All to the Netherlands 1830: South to Belgium | |
 Brakel | Lordship | n/a | n/a | 1213: First mentioned c. 1270: Part to Asseburg, another to Everstein 1290: Part sold to the Bishopric of Paderborn 1316: Everstein share sold to Paderborn 1350: Brakel share sold to the City of Brakel 1385: Brakel family extinct 16th Century: Asseburg share to Paderborn 1803: All to Prussia | |
 Brakel | Imperial City | Low Rhen | RH | Originally to the Lords of Brakel 1290: Part to the Bishopric of Paderborn 1350: Acquired semi-independence 1803: To Prussia | |
 Brandenburg | Margraviate 1356: Electorate | Upp Sax | EL | 1157: Originally created as the "Northern March" 1266: Partitioned into Brandenburg-Stendal and Brandenburg-Salzwedel; margravial title shared 1317: Reunited by Brandenburg-Stendal 1356: HRE Elector 1415: Sold to Nuremberg 1440: Partitioned into Brandenburg-Kulmbach, itself and Brandenburg-Ansbach 1470: Acquired by Brandenburg-Ansbach 1486: Partitioned into itself, Brandenburg-Ansbach and Brandenburg-Kulmbach 1618: Acquired Prussia by marriage 1701: Also made King in Prussia | |
 Brandenburg | Bishopric | Upp Sax | EC | 949: Diocese established 983: Wendish uprising; diocese lost though bishops continued to be appointed 1165: Bishopric recreated 1569: To the Electorate of Brandenburg | |
 Brandenburg-Ansbach | Margraviate | Franc | PR | 1440: Partitioned from Brandenburg 1486: Partitioned into itself and Brandenburg-Kulmbach 1515: Partitioned into Brandenburg-Kulmbach and itself 1603: Partitioned into itself and Brandenburg-Bayreuth 1791: Sold to Prussia | |
| Brandenburg-Bayreuth | Margraviate | Franc | PR | 1603: Partitioned from Brandenburg-Ansbach 1655: Appanage Brandenburg-Kulmbach created 1726: Inherited by Brandenburg-Kulmbach 1769: Extinct; to Brandenburg-Ansbach | |
| Brandenburg-Kulmbach | Margraviate | Franc | see above | 1440: Partitioned from Brandenburg 1457: To Brandenburg-Ansbach 1464: Extinct 1486: Partitioned from Brandenburg 1495: Extinct; to Brandenburg-Ansbach 1515: Partitioned from Brandenburg-Ansbach 1557: Extinct; to Brandenburg-Ansbach 1655: Appanage created in Brandenburg-Bayreuth 1726: Inherited Brandenburg-Bayreuth; appanage abolished | |
| Brandenburg-Küstrin | Margraviate | Upp Sax | PR | 1535: Partitioned from Brandenburg 1571: Extinct; to Brandenburg | |
| Brandenburg-Salzwedel | Margraviate | n/a | n/a | 1266: Partitioned from Brandenburg 1317: Extinct; to Brandenburg-Stendal | |
| Brandenburg-Stendal | Margraviate | n/a | n/a | 1266: Partitioned from Brandenburg 1317: Renamed to Brandenburg | |
 Brandis | Barony | Swab | SC | 12th century: First mentioned 1394: Purchased many territories from Werdenberg 1437: Purchased Maienfeld 1509: Sold Maienfeld to the Grey Leagues 1510: Sold remaining territories to Sulz | |
 Brauneck | Lordship | n/a | n/a | 1230: Partitioned from Hohenlohe 1249: Partitioned into Brauneck-Brauneck and Brauneck-Haltenbergstetten | |
| Brauneck-Brauneck | Lordship | n/a | n/a | 1249: Partitioned from Brauneck 1429: Extinct; to Burgraviate of Magdeburg of the House of Hardegg 1448: Sold to Brandenburg-Ansbach 1791: To Prussia 1806: To Bavaria 1810: To Württemberg | |
| Brauneck-Haltenbergstetten | Lordship | n/a | n/a | 1249: Partitioned from Brauneck 1268: Partitioned into itself and Brauneck-Neuhaus 1366: Sold to Hohenlohe-Speckfeld 1412: To Castell and Limpurg 1415: To Lordship of Rosenberg as fief of the Bishopric of Würzburg 1632: To the Bishopric of Würzburg 1636: To Hatzfeld 1794: To the Bishopric of Würzburg 1803: To Hohenlohe-Bartenstein-Jagstberg 1806: To Württemberg | |
| Brauneck-Neuhaus | Lordship | n/a | n/a | 1268: Partitioned from Brauneck-Haltenbergstetten 1320: Made fief of the Bishopric of Würzburg 1340: Extinct 1431: To the Teutonic Order 1809: To Württemberg | |
 Braunschweig See: Brunswick | Duchy | ||||
 Breda | Lordship 1403: Barony | Burg | WE | 1080: First mentioned; imperial immediate fief of the Empire 1327: Sold to Brabant 1350: Sold to Wassenaar 1403: HRE Baron; to Nassau-Dillenburg by marriage 1544: To Orange-Nassau 1795: To France 1815: To the Netherlands | |
 Bregenz | County | Swab | SW | 926: First mentioned 1171: To Tübingen by marriage 1180: To Montfort 1258: To Montfort-Bregenz 1338: To Montfort-Tettnang 1354: To Montfort-Tettnang-Bregenz 1379: To Elder and Younger lines of Montfort-Tettnang-Bregenz 1451: Elder line sold to Austria 1523: Younger line sold to Austria 1805: To Bavaria 1814: To Austria | |
 Brehna | County | n/a | n/a | 1034: Partitioned from the County of Eilenberg 1106: Extinct; to Wettin 1157: Partitioned from Wettin 1290: Extinct; to Saxe-Wittenberg 1356: To the Electorate of Saxony 1658: To Saxe-Merseburg 1738: To the Electorate of Saxony 1815: To Prussia | |
 Breisgau (Breisachgau) | County Landgraviate | n/a | n/a | 771: Originally a gau county 1077: To Zähringen 1218: To Baden-Hachberg 1306: To Baden-Hachberg-Sausenberg 1318: To Freiburg 1368: To Austria 1395: To Baden-Hachberg-Sausenberg 1398: To Austria; made part of Further Austria 1801: To Breisgau-Modena 1805: To Baden | |
 Breisgau-Modena | Duchy | Aust | PR | 1801: Compensation for the former Duke of Modena 1803: Acquired the Ortenau 1805: Divided between Baden and Württemberg | |
 Breitenegg (Breitenegg) | HRE Lordship 1635: County | Bav | SC | 10th century: To Prunn By 1129: To Breitenbrunn 1229: To Laaber-Prunn 1285: To Hirschberg 1302: To Laaber 1433: To Gumppenberg 1463: To Laaber 1465: To Pappenheim 1473: To Wildenstein 1534: 1/2 to Welden by marriage 1583: Extinct; other half to Haslangg and Rinderbach 1592: Welden half sold to Palatinate-Neuburg 1595: Haslangg and Rinderbach half sold to Bavaria 1611: Palatinate-Neuburg half sold to Bavaria 1624: To Tilly as fief of Bavaria 1631: To Tilly with sovereign rights 1648: Joined Bavarian Circle 1654: Seat in the Imperial Diet 1744: Extinct; to Gumppenberg 1792: Sold to Bavaria | |
 Bremen | Archbishopric | Low Sax | EC | 787: Diocese established 805: Formally constituted 848: United with Hamburg; Archbishopric 1180: HRE Prince of the Empire 1648: To Sweden as the Duchy of Bremen, ruled as Bremen-Verden, in personal union with the Principality of Verden | |
 Bremen | Imperial City | Low Sax | RH | 1186: Obtained autonomy within the Bremen 1358: Joined Hanseatic League 1366: De facto independent 1381: Acquired Bederkesa 1653: Bederkesa to Sweden, attached Bremen-Verden 1654: Free Imperial City 1810: To France 1813: Free City | |
 Bremen-Verden | Duchy of Bremen; Principality of Verden | Low Sax | PR | 1648: Bremen and Verden secularised by Sweden, de facto in personal union 1712: To Denmark 1715: Sold to Hanover 1807: To Westphalia 1810: To France 1813: To Hanover | |
 Bretzenheim HRE Prince of Bretzenheim and Count of Lindau | Lordship 1664: Barony 1774: County 1790: Principality | Upp Rhen | SC | 10th century: Fief of the Archbishopric of Cologne Fief held by the Palatinate Fief held by Falkenstein 1642: To Velen 1664: HRE Baron 1733: Extinct; to Cologne 1734: To Virmont 1744: Extinct; to Cologne 1747: To Roll zu Bernau 1772: To Heideck 1790: Imperial immediacy 1795: To France 1803: Heideck granted Lindau in compensation 1815: To Prussia | |
 Breuberg | Lordship 1323: County | Upp Rhen | RH | 1178: First mentioned; branch of Lützelbach family 1239: Acquired part of Büdingen 1323: Extinct; divided between Wertheim, Trimberg and Eppstein 1497: All to Wertheim 1556: To Erbach and Stolberg-Königstein 1574: Stolberg share to Löwenstein-Wertheim 1806: To the Grand Duchy of Hesse (Hesse-Darmstadt) | |
 Brixen | Bishopric | Aust | EC | 580: First mentioned 1027: Acquired the Norital 1091: Acquired the Puster Valley 1179: HRE Prince of the Empire 1803: To Austria; attached to the Tyrol 1805: To Bavaria 1814: To Austria 1918: To Italy | |
 Broich | Lordship | n/a | n/a | 1093: 1st mentioned 11th century: Made fief of Berg 13th century: Asserted imperial immediacy 1372: Extinct; to Limburg-Styrum 1376: Made fief of Berg 1439: Fief to Limburg-Broich 1505: Fief to Dhaun-Falkenstein 1682: Fief to Leiningen-Dagsburg | |
 Bruchhausen | County | n/a | n/a | 1199: Partitioned from Wildeshausen 1234: Partitioned into Neubruchhausen and Altbruchhausen | |
 Bruchsal and Odenheim | Abbacy 1503: Provostry | Upp Rhen | RP | 1110-8: Established at Odenheim 1161: Imperial immediacy 1496: HRE Lord 1503: Abbey converted to secular Provostry 1507: Relocated to Bruchsal 1803: To Baden | |
| Brunnen | Abbacy | SP | 1521: Identified in the Reichsmatrikel 1521 as an Imperial Abbey, identified as Mariabrunn Abbey in Carinthia | ||
| Brunswick and Lüneburg | Duchy | n/a | n/a | 1235: Descendants of Henry the Lion, Duke of Saxony confirmed with territory around Brunswick and Lüneburg 1269: Partitioned into Brunswick-Wolfenbüttel and Lüneburg | |
| Brunswick-Calenberg | Duchy | Low Sax | PR | 1432: Partitioned from Brunswick-Wolfenbüttel 1463: Inherited Brunswick-Göttingen; renamed to Brunswick-Calenberg-Göttingen 1634: Partitioned from Brunswick-Wolfenbüttel 1692: Made Electorate of Hanover | |
| Brunswick-Calenberg-Göttingen | Duchy | Low Sax | PR | 1463: Renamed from Brunswick-Calenberg 1503: Partitioned into Brunswick-Wolfenbüttel and itself 1584: Extinct; to Brunswick-Wolfenbüttel | |
| Brunswick-Dannenberg | Duchy | n/a | n/a | 1569: Appanage created in Brunswick-Lüneburg 1598: Appanage Brunswick-Hitzacker created 1636: Extinct; to Brunswick-Wolfenbüttel | |
| Brunswick-Göttingen | Duchy | n/a | n/a | 1291: Partitioned from Brunswick-Wolfenbüttel 1344: Partitioned into Brunswick-Wolfenbüttel and itself 1463: Extinct; to Brunswick-Calenberg | |
| Brunswick-Grubenhagen | Duchy | Low Sax | PR | 1291: Partitioned from Brunswick-Wolfenbüttel 1361: Partitioned into Brunswick-Grubenhagen-Salzderhelden and Brunswick-Grubenhagen-Osterode 1452: Reunited by Salzderhelden line 1479: Partitioned into Brunswick-Grubenhagen-Heldenberg and Brunswick-Grubenhagen-Osterode 1526: Reunited by Osterode line 1596: Extinct; to Brunswick-Wolfenbüttel | |
| Brunswick-Grubenhagen-Heldenberg | Duchy | Low Sax | PR | 1479: Partitioned from Brunswick-Grubenhagen 1526: Extinct; to Brunswick-Grubenhagen-Osterode | |
| Brunswick-Grubenhagen-Osterode | Duchy | Low Sax | PR | 1361: Partitioned from Brunswick-Grubenhagen 1452: Extinct; to Brunswick-Grubenhagen-Salzderhelden 1479: Partitioned from Brunswick-Grubenhagen 1526: Renamed to Brunswick-Grubenhagen | |
| Brunswick-Grubenhagen-Salzderhelden | Duchy | n/a | n/a | 1361: Partitioned from Brunswick-Grubenhagen 1452: Renamed to Brunswick-Grubenhagen | |
| Brunswick-Hitzacker | Duchy | n/a | n/a | 1598: Appanage created in Brunswick-Dannenberg 1634: Inherited Brunswick-Wolfenbüttel; appanage abolished | |
| Brunswick-Lüneburg | Duchy | Low Sax | PR | 1388: Formed after defeating the Electorate of Saxony in the War of the Lüneburg Succession 1527: Partitioned into Brunswick-Lüneburg-Harburg and itself 1539: Partitioned into itself and Brunswick-Lüneburg-Gifhorn 1569: Appanage Brunswick-Dannenberg created 1705: Extinct; to Electorate of Hanover | |
| Brunswick-Lüneburg-Gifhorn | Duchy | Low Sax | PR | 1539: Partitioned from Brunswick-Lüneburg 1642: Extinct; to Brunswick-Lüneburg | |
| Brunswick-Lüneburg-Harburg | Duchy | Low Sax | PR | 1527: Partitioned from Brunswick-Lüneburg 1642: Extinct; divided between Brunswick-Celle and Brunswick-Wolfenbüttel | |
| Brunswick-Wolfenbüttel | Duchy | Low Sax | PR | 1269: Partitioned from Brunswick and Lüneburg 1291: Partitioned into Brunswick-Grubenhagen, Brunswick-Göttingen and itself 1292: Extinct; to Brunswick-Göttingen 1344: Partitioned from Brunswick-Göttingen 1432: Partitioned into Brunswick-Calenberg and itself 1482: Extinct; to Brunswick-Calenberg-Göttingen 1503: Partitioned from Brunswick-Calenberg-Göttingen 1634: Partitioned into itself and Brunswick-Calenberg 1667: Appanages Brunswick-Wolfenbüttel-Bevern and Brunswick-Wolfenbüttel-Calvörde created 1690: Partitioned into itself and Brunswick-Wolfenbüttel-Blankenburg 1806: Inherited by appanage Brunswick-Wolfenbüttel-Oels 1814: Renamed to Duchy of Brunswick | |
| Brunswick-Wolfenbüttel-Bevern | Duchy | n/a | n/a | 1667: Appanage created in Brunswick-Wolfenbüttel 1735: Inherited Brunswick-Wolfenbüttel; appanage passed to Duke's younger brother 1809: Extinct; appanage abolished | |
| Brunswick-Wolfenbüttel-Blankenburg | Duchy | Low Rhen | WE | 1690: Partitioned from Brunswick-Wolfenbüttel 1731: Inherited and renamed to Brunswick-Wolfenbüttel | |
| Brunswick-Wolfenbüttel-Calvörde | Duchy | n/a | n/a | 1667: Appanage created in Brunswick-Wolfenbüttel 1685: Inherited Brunswick-Wolfenbüttel; appanage abolished | |
| Brunswick-Wolfenbüttel-Oels | Duchy | n/a | n/a | 1792: Appanage created for Frederick Augustus, husband of the late Duchess of Württemberg-Oels 1806: Inherited Brunswick-Wolfenbüttel; appanage abolished | |
 Buchau | Abbacy | Swab | RP SC | c. 770: Abbey established 1347: Imperial immediacy; HRE Princess of the Empire 1415: Converted to a secular nunnery 1625: Acquired Strassberg 1803: To Thurn und Taxis 1806: To Württemberg; Strassberg to Hohenzollern-Sigmaringen | |
 Buchau | Imperial City | Swab | SW | c. 1250: Free Imperial City 1803: To Thurn und Taxis 1806: To Württemberg | |
 Buchhorn (Friedrichshafen) | Imperial City | Swab | SW | 1275: Free Imperial City 1803: To Württemberg | |
 Burgau | Lordship 1212: Margraviate | n/a | n/a | 1147: First mentioned 1212: HRE Margrave 1301: Extinct; to Austria 1304: Invested in sons of Albert I Later made part of Further Austria 1595: To Charles of Austria 1618: Extinct; to Austria 1805: To Bavaria | |
 Burgundy (Franche-Comté) | County 1127: Free County 1190: Archcounty 1169: Also County Palatine | Burg | n/a | 982: County created 1127: HRE Free County 1190: HRE Archcount 1405: To the Duchy of Burgundy 1477: To France 1493: To the Burgundian Netherlands 1516: To the Spanish Netherlands 1678: To France [1] | |
 Burgundy | Landgraviate | n/a | n/a | 1218: Created after the extinction of Zähringen; to Buchegg 1252: First mentioned 1313: To Habsburg-Kyburg 1406-8: To Bern | |
 Bürresheim (Burresheim) | Lordship | n/a | n/a | 10th century 1157: Half to Cologne 1189: Other half to Trier, fief held by Schöneck 1473: Schöneck half sold to Breitbach 1477: Part of Cologne half sold to Breitbach 1659: All to Breitbach, who renamed to "Breitbach-Bürresheim" as fief of the Archbishoprics 1691: HRE Baron 1796: Extinct; to France though rights passed to Renesse | |
 Burtscheid | Abbacy | Low Rhen | RP | 997: Abbey established 1018: Obtained surrounding territory 1138: Imperial immediacy; HRE Prince of the Empire 1220: Converted to a nunnery 1794: To France 1802: Abbey dissolved 1815: To Prussia | |
 Buxheim | Abbacy | n/a | SP | c. 1100: Charterhouse established 1548: Imperial immediacy 1802: To Ostein 1806: To Bavaria 1812: Charterhouse dissolved |
