William I of Hauteville, called ‘the Bad’, king of Sicily

He succeeded his father Roger II in 1154. In 1156, after a series of conflicts, Pope Adrian IV came to terms with him: in the treaty of Benevento he invested him with the kingdom, including Capua and Naples, and granted him the apostolic legateship of Sicily. The conflict with the feudal barons led, in 1160, to the assassination of his most trustworthy minister, Maio of Bari. In 1161 he was captured by the rebellious nobles; he was then freed, but his son Roger died in the disorders. William I died in 1166, leaving the regency of the kingdom to his wife Margaret of Navarre during the minority of his son William II.