The Battle of Cerami was fought in June 1063 and was one of the most significant battles in the Norman conquest of Sicily, 1060–1091. The battle was fought between a Norman expeditionary force and a Muslim alliance of Sicilian and Zirid troops. The Normans fought under the command of Roger de Hauteville, the youngest son of Tancred of Hauteville and brother of Robert Guiscard. The Muslim alliance consisted of the native Sicilian Muslims under the Kalbid ruling class of Palermo, led by Ibn al-Hawas, and Zirid reinforcements from North Africa led by the two princes, Ayyub and 'Ali. The battle was a resounding Norman victory that utterly routed the opposing force, causing divisions amongst the Muslim aristocracy which ultimately paved the way for the eventual capture of the Sicilian capital, Palermo, by the Normans and subsequently the rest of the island.