The Duchy of the Archipelago, also known as Duchy of Naxos or Duchy of the Aegean, was a maritime state created by Venetian interests in the Cyclades archipelago in the Aegean Sea, in the aftermath of the Fourth Crusade, centered on the islands of Naxos and Paros. It included all the Cyclades. In 1537, it became a tributary of the Ottoman Empire, and was annexed by the Ottomans in 1579; however, Christian rule survived in islands such as Sifnos and Tinos.
William of Villehardouin was the fourth prince of Achaea in Frankish Greece, from 1246 to 1278. The younger son of Prince Geoffrey I, he held the Barony of Kalamata in fief during the reign of his elder brother Geoffrey II. William ruled Achaea as regent for his brother during Geoffrey's military campaigns against the Greeks of Nicaea, who were the principal enemies of his overlord, the Latin Emperor of Constantinople Baldwin II. William succeeded his childless brother in the summer of 1246. Conflicts between Nicaea and Epirus enabled him to complete the conquest of the Morea in about three years. He captured Monemvasia and built three new fortresses, forcing two previously autonomous tribes, the Tzakones and Melingoi, into submission. He participated in the unsuccessful Egyptian crusade of Louis IX of France, who rewarded him with the right to issue currency in the style of French royal coins.
The Battle of the Olive Grove of Kountouras took place in the summer of 1205, in Messenia in the Morea peninsula, between the Frankish Crusaders and the local Byzantine Greeks, resulting in a victory of the Franks and the collapse of the local resistance.
Geoffrey II of Villehardouin was the third prince of Achaea. From his accession to the princely throne, he was a powerful and respected person, and even French knights came to the principality to enter his service. Geoffrey II emerged as the most powerful vassal of the Latin Empire of Constantinople, the person around whom the crusaders' states in modern Greece gradually regrouped themselves. He came to the rescue of the imperial capital three times. As a reward of his services to the Latin Empire, he was granted suzerainty over the island of Euboea by his brother-in-law, Emperor Baldwin II of Constantinople (1228–1261). He was also a humane prince, benevolent and just, solicitous for the condition of the common people.
Guy I de la Roche (1205–1263) was the Duke of Athens, the son and successor of the first duke Othon. After the conquest of Thebes, Othon gave half the city in lordship to Guy.
John I de la Roche succeeded his father, Guy I, as Duke of Athens in 1263. He was cultured and chivalrous, spoke fluent Greek, and read Herodotus.
Guy or Guido Pallavicini, called Marchesopoulo by his Greek subjects, was the first marquess of Bodonitsa in Frankish Greece from 1204 to his death in or shortly after 1237. He was one of the most important Frankish rulers in Greece, and played a major role in the short-lived Kingdom of Thessalonica: in 1208–1209 he supported the Lombard rebellion against King Demetrius of Montferrat, but by 1221 he was the kingdom's regent (bailli), and was left to defend the city against the ruler of Epirus, Theodore Komnenos Doukas. Left unsupported by the Latin Empire, and with a projected crusade to relieve the city delayed, he surrendered the city in December 1224. The belated arrival of the crusade helped to save his own fief from falling to the Epirotes, however, and he was soon able to return there, dying on or shortly after 1237.
The War of the Euboeote Succession was fought in 1256–1258 between the Prince of Achaea, William of Villehardouin, and a broad coalition of other rulers from throughout Frankish Greece who felt threatened by William's aspirations. The war was sparked by Villehardouin's intervention in a succession dispute over the northern third of the island of Euboea, which was resisted by the local Lombard barons with the aid of the Republic of Venice. The Lord of Athens and Thebes, Guy I de la Roche, also entered the war against William, along with other barons of Central Greece. Their defeat at the Battle of Karydi in May/June 1258 effectively brought the war to an end in an Achaean victory, although a definite peace treaty was not concluded until 1262.
Angelo Sanudo was the second Duke of the Archipelago from 1227, when his father, Marco I, died, until his own death.
Oberto, Uberto, or Umberto II was the Count of Biandrate (Blan-Dras) in Lombardy and a participant in the Fourth Crusade.
The Triarchy of Negroponte was a crusader state established on the island of Euboea after the partition of the Byzantine Empire following the Fourth Crusade. Partitioned into three baronies run by a few interrelated Lombard families, the island soon fell under the influence of the Republic of Venice. From circa 1390, the island became a regular Venetian colony as the Realm of Negroponte.
Boniface of Verona was a Lombard Crusader lord in Frankish Greece during the late 13th and early 14th century. A third son from a junior branch of his family, he sold his castle to equip himself as a knight, became a protégé of Guy II de la Roche, Duke of Athens, expelled the Byzantines from Euboea in 1296, and advanced to become one of the most powerful lords of Frankish Greece. Following Guy II's death, he served as regent for the Duchy of Athens in 1308–09, and was captured by the Catalan Company in the Battle of Halmyros in March 1311. The Catalans held Boniface in high regard, and offered to make him their leader. Boniface refused, but retained close relations with them, sharing their hostility towards the Republic of Venice and its own interests in Euboea. Boniface died in late 1317 or early 1318, leaving his son-in-law, the Catalan vicar-general Alfonso Fadrique, as the heir of his domains.
The Frankokratia, also known as Latinokratia and, for the Venetian domains, Venetokratia or Enetokratia, was the period in Greek history after the Fourth Crusade (1204), when a number of primarily French and Italian states were established by the Partitio terrarum imperii Romaniae on the territory of the dissolved Byzantine Empire.
The Battle of Demetrias was a sea engagement fought at Volos in Greece in the early 1270s between a Byzantine fleet and the assembled forces of the Latin barons of Euboea (Negroponte) and Crete. The battle was fierce, and initially in favour of the Latins, but the timely arrival of Byzantine reinforcements tipped the scale, resulting in a crushing Byzantine victory.
Bartholomew II Ghisi was a Latin feudal lord in medieval Greece, lord of Tinos and Mykonos, Triarch of Negroponte and Grand Constable of the Principality of Achaea.
James II of Avesnes was a knight of the Fourth Crusade. He was probably the son of James of Avesnes of Hainaut, who was a leading protagonist of the Third Crusade.
The First Parliament of Ravennika was convened in May 1209 by Latin Emperor Henry of Flanders in the town of Ravennika in Central Greece in an attempt to resolve the rebellion of the Lombard barons of the Kingdom of Thessalonica.
The Second Parliament of Ravennika was convened in May 1210 by Latin Emperor Henry of Flanders in the town of Ravennika in Central Greece in order to resolve the differences between the princes of Frankish Greece and the Roman Catholic clergy of their domains.
The dalle Carceri were a noble family of Verona and Frankish Negroponte from the 12th to the 14th century.
Carintana dalle Carceri was the triarch of the northern third (Oreus) of the Lordship of Negroponte in Frankish Greece in circa 1220–1255. She was the daughter of Rizzardo dalle Carceri, whom she had succeeded in that capacity. Her childless death in 1255 provoked the War of the Euboeote Succession involving Venice and most rulers of Frankish Greece. This followed the complaint of one of Carintana's kinsmen, Leone dalle Carceri, to William of Villehardouin, Prince of Achaea, about being preempted from taking Carintana's inheritance by two other triarchs of Euboea, Narzotto dalle Carceri and his father-in-law Guglielmo da Verona. Leone's appeal resulted in Prince William ordering the imprisonment of Narzotto and Guglielmo and invading Negroponte, where he seized the northern triarchy of Oreus and the part of the city of Negroponte that pertained to the triarchs. The Venetian bailly retaliated, and a major regional conflict ensued. When peace was formally concluded in 1262, the triarchs Guglielmo da Verona, Narzotto dalle Carceri, and Grapella dalle Carceri officially recognized the suzerainty of the Prince of Achaia and undertook to honor their obligations to him and to Venice, "as they had been in the time of the Lady Carintana."