Roger IV (1152–1161) was the eldest son of William I of Sicily and Margaret of Navarre.
In 1156, barons opposed to Maio of Bari began to consider removing not only the emir, but also the king, and putting Roger on the throne.
However, the populace instead supported the succession claims of Simon, erstwhile Prince of Taranto, the king's illegitimate half-brother.
An alternative theory, advanced by William's enemy Falcandus, is that Roger died after repeated kicking by his father, who was in a rage at having been betrayed by his son.
Roger was interred in the cathedral with his brother Henry, Prince of Capua, but later was moved to the chapel of Saint Mary Magdalene in Monreale.