This Palgrave Pivot explores the representation of sea kings, sinners, and saints in the mid-thirteenth century Chronicles of the Kings of Man and the Isles, the single most important text for the history of the kingdoms of Man and the Isles, c.1066-1300. The focus of the Chronicles on the power struggles, plots and intrigues within the ruling dynasties of Man and the Isles offers an impressive array of heroes and villains. The depiction of the activities of heroic sea kings like Godred Crovan, tyrannical usurpers like Harald son of Godred Don, and their concubines and wives, as well as local heroes like Saint Maughold, raises important questions concerning the dynamic interactions of power, gender and historical writing in the medieval Kingdoms of Man and the Isles, and provide new insights into the significance of the text that is our most important source of information on these ‘Forgotten Kingdoms’ of the medieval British Isles.