William III, a scion of the Hauteville dynasty, was the last Norman King of Sicily, who reigned briefly for ten months in 1194. He was overthrown by his great-aunt Constance and her husband Emperor Henry VI.

Constance I was reigning Queen of Sicily from 1194–98, jointly with her spouse from 1194 to 1197, and with her infant son Frederick II, Holy Roman Emperor, in 1198. She is particularly notable for her actions against her own family, the Norman kings of Sicily; she played an important role in the end of the Hauteville presence in Sicily. She was also Holy Roman Empress and later Dowager by marriage to Henry VI, Holy Roman Emperor.