Year 855 (DCCCLV) was a common year starting on Tuesday of the Julian calendar.
The House of Zähringen was a dynasty of Swabian nobility. The family's name derived from Zähringen Castle near Freiburg im Breisgau. The Zähringer in the 12th century used the title of Duke of Zähringen, in compensation for having conceded the title of Duke of Swabia to the Staufer in 1098. The Zähringer were granted the special title of Rector of Burgundy in 1127, and they continued to use both titles until the extinction of the ducal line in 1218.
Lothair I was a 9th-century Carolingian emperor and king of Italy (818–855) and Middle Francia (843–855).
Lotharingia was a medieval successor kingdom of the Carolingian Empire. It comprised present-day Lorraine (France), Luxembourg, Saarland (Germany), Netherlands, and the eastern half of Belgium, along with parts of today's North Rhine-Westphalia (Germany), Rhineland-Palatinate (Germany) and Nord (France). It was named after King Lothair II, who received this territory after the Kingdom of Middle Francia of his father, Lothair I, had been divided among his three sons in 855.
Lothair II was the king of Lotharingia from 855 until his death in 869. He was the second son of Emperor Lothair I and Ermengarde of Tours. He was married to Teutberga, daughter of Boso the Elder.
The Treaty of Mersen or Meerssen, concluded on 8 August 870, was a treaty to partition the realm of Lothair II, known as Lotharingia, by his uncles Louis the German of East Francia and Charles the Bald of West Francia, the two surviving sons of Emperor Louis I the Pious. The treaty followed an earlier treaty of Prüm which had split Middle Francia between Lothair I's sons after his death in 855.
The Free County of Burgundy was a medieval feudal state ruled by a count from 982 to 1678. It was also known as Franche-Comté, from French: franc comte meaning 'free count', and was located in the modern region of Franche-Comté. It bordered the Duchy of Burgundy to the west, which was part of France from 843.
Richard, Duke of Burgundy (858–921), also known as Richard of Autun or Richard the Justiciar, was Count of Autun from 880 and the first Margrave and Duke of Burgundy. He eventually attained suzerainty over all the counties of Burgundy save Mâcon and by 890 he was referred to as dux (duke) and by 900 as marchio (margrave). By 918 he was being called dux Burgundionem or dux Burgundiae, which probably signified less the existence of a unified Burgundian dukedom than feudal suzerainty over a multiplicity of counties in a specific region.
Hugh, known as Hugh of Arles or Hugh of Provence, was the king of Italy from 926 until his death. He belonged to the Bosonid family. During his reign, he empowered his relatives at the expense of the aristocracy and tried to establish a relationship with the Byzantine Empire. He had success in defending the realm from external enemies, but his domestic habits and policies created many internal foes and he was removed from power before his death.
Rudolph II, a member of the Elder House of Welf, was King of Burgundy from 912 until his death. He initially succeeded in Upper Burgundy and also ruled as King of Italy from 922 to 926. In 933 Rudolph acquired the Kingdom of Lower Burgundy (Provence) from King Hugh of Italy in exchange for the waiver of his claims to the Italian crown, thereby establishing the united Kingdom of Burgundy.
Rudolph III, called the Idle or the Pious, was the king of Burgundy from 993 until his death. He was the last ruler of an independent Kingdom of Burgundy, and the last male member of the Burgundian group of the Elder House of Welf.
Boso was a Frankish nobleman of the Bosonid family who was related to the Carolingian dynasty and who rose to become King of Lower Burgundy and Provence.
Kingdom of Burgundy was a name given to various states located in Western Europe during the Middle Ages. The historical Burgundy correlates with the border area of France and Switzerland and includes the major modern cities of Geneva and Lyon.
The Kingdom of Burgundy, known from the 12th century as the Kingdom of Arles, also referred to in various context as Arelat, the Kingdom of Arles and Vienne, or Kingdom of Burgundy-Provence, was a realm established in 933 by the merger of the kingdoms of Upper and Lower Burgundy under King Rudolf II. It was incorporated into the Holy Roman Empire in 1033 and from then on was one of the empire's three constituent realms, together with the Kingdom of Germany and the Kingdom of Italy. By the mid-13th century at the latest, however, it had lost its concrete political relevance.
The Kingdom of Upper Burgundy was a Frankish dominion established in 888 by the Welf king Rudolph I of Burgundy within the territory of former Middle Francia. It grew out of the Carolingian margraviate of Transjurane Burgundy southeast of the Jura Mountains together with the adjacent County of Burgundy (Franche-Comté) in the northwest. The adjective 'upper' refers to its location upstream in the Rhône river valley, as distinct from Lower Burgundy and also from the Duchy of Burgundy west of the Saône river. Upper Burgundy reunited with the Kingdom of Lower Burgundy in 933 to form the Kingdom of Burgundy, later known as Kingdom of Arles or Arelat.
In medieval historiography, West Francia or the Kingdom of the West Franks constitutes the initial stage of the Kingdom of France and extends from the year 843, from the Treaty of Verdun, to 987, the beginning of the Capetian dynasty. It was created from the division of the Carolingian Empire following the death of Louis the Pious, with its neighbor East Francia eventually evolving into the Kingdom of Germany.
Middle Francia was a short-lived Frankish kingdom which was created in 843 by the Treaty of Verdun after an intermittent civil war between the grandsons of Charlemagne resulted in division of the united empire. Middle Francia was allocated to emperor Lothair I, the eldest son and successor of emperor Louis the Pious. His realm contained the imperial cities of Aachen and Pavia, but lacked any geographic or cultural cohesion, which prevented it from surviving and forming a nucleus of a larger state, as was the case with West Francia and East Francia.
The Bosonids were a dynasty of Carolingian era dukes, counts, bishops and knights descended from Boso the Elder. Eventually they married into the Carolingian dynasty and produced kings and an emperor of the Frankish Empire.
