Year 855 (DCCCLV) was a common year starting on Tuesday of the Julian calendar.
Bohemond II was Prince of Taranto from 1111 to 1128 and Prince of Antioch from 1111/1119 to 1130. He was the son of Bohemond I, who in 1108 was forced to submit to the authority of the Byzantine Empire in the Treaty of Devol. Three years later, the infant Bohemond inherited the Principality of Taranto under the guardianship of his mother, Constance of France. The Principality of Antioch was administered by his father's nephew, Tancred, until 1111. Tancred's cousin, Roger of Salerno, managed the principality from 1111 to 1119. After Roger died in the Battle of the Field of Blood, Baldwin II of Jerusalem took over the administration of Antioch. However, he did acknowledge Bohemond's right to personally rule the principality upon reaching the age of majority.
Louis II, sometimes called the Younger, was the king of Italy and emperor of the Carolingian Empire from 844, co-ruling with his father Lothair I until 855, after which he ruled alone.
The Duchy of Benevento was the southernmost Lombard duchy in the Italian Peninsula that was centred on Benevento, a city in Southern Italy. Lombard dukes ruled Benevento from 571 to 1077, when it was conquered by the Normans for four years before it was given to the Pope. Being cut off from the rest of the Lombard possessions by the papal Duchy of Rome, Benevento was practically independent from the start. Only during the reigns of Grimoald and the kings from Liutprand on was the duchy closely tied to the Kingdom of the Lombards. After the fall of the kingdom in 774, the duchy became the sole Lombard territory which continued to exist as a rump state, maintaining its de facto independence for nearly 300 years, although it was divided after 849.
Pandulf I Ironhead was the Prince of Benevento and Capua from 943 until his death. He was made Duke of Spoleto and Camerino in 967 and succeeded as Prince of Salerno in 977 or 978. He was an important nobleman in the fight with the Byzantines and Saracens for control of the Mezzogiorno in the centuries after the collapse of Lombard and Carolingian authority on the Italian Peninsula. He established himself over almost the whole of the southern half of Italia before his death in March 981.
Siconulf was the first prince of Salerno, the brother of Sicard, prince of Benevento (832–839), who was assassinated by Radelchis. In response to Sicard's murder, the people of Salerno proclaimed Siconulf prince in opposition to Radelchis. At the time Radelchis was holding Siconulf prisoner in Taranto. A group of people from the cities of Salerno and Amalfi went there in disguise as Amalfian merchants and rescued Siconulf from prison, bringing him to Salerno.
Sico was the Lombard Prince of Benevento from the 817 to his own death.
Pandulf II was the prince of Salerno (981), the second of such princes of the family of the princes of Capua. He was originally appointed heir to the childless Gisulf I of Salerno, who had been reinstated on his throne by Pandulf's father, Pandulf Ironhead. On the former's death in 977, he succeeded him as co-prince of Salerno with his father. On the latter's death in March 981, the Ironhead's great principality was divided such that he inherited only Salerno, while Capua-Benevento went to his elder brother Landulf IV.
Atenulf I, called the Great, was the prince of Capua from 7 January 887 and of Benevento from 899, when he conquered that principality. He also used the title princeps gentis Langobardorum: "prince of the Lombard people," an echo of the title used by the earliest prince of Benevento following the collapse of Lombard cohesion in 774.
Sicard was the Prince of Benevento from 832. He was the last prince of a united Benevento which covered most of the Mezzogiorno. On his death, the principality descended into civil war which split it permanently. He was the son and successor of the Spoletan Sico.
Guaimar I was the prince of Salerno from 880, when his father entered the monastery of Monte Cassino in August. His parents were Prince Guaifer and Landelaica, daughter of Lando I of Capua. From 877, he was associated with his father on the throne, a practice which had begun with the previous dynasty and continued until the end of Salernitan independence in 1078.
Guaimar II was the Lombard prince of Salerno from 901, when his father retired to a monastery, to his death. His father was Guaimar I and his mother was Itta. He was associated with his father in the principality from 893. He was responsible for the rise of the principality: he restored the princely palace, built the palace church of San Pietro a campanile, and restored gold coinage.
John I was the duke of Amalfi (1004–1007) and prince of Salerno (981–983). He was the son of Manso I. His father associated him in the principality of Salerno, but their rule was unpopular and they were overthrown by John II. John inherited Amalfi on his father's death and ruled a short three years.
Peter was an early medieval Italian ruler, who was originally the tutor and guardian of the young prince of Salerno, Sico II. He held that post for two years from 851 to 853.
Lando I was the count of Capua from 843. He was the eldest son and successor of Landulf the Old. Like his father, he supported Siconulf against Radelchis in the civil war dividing the Principality of Benevento in the 840s.
The Principality of Capua was a Lombard state centred on Capua in Southern Italy, usually de facto independent, but under the varying suzerainty of Holy Roman and Eastern Roman Empires. It was originally a gastaldate, then a county, within the principality of Salerno.
