Roussel de Bailleul (also Ursellus de Ballione in Latin or Roscelin or Roskelin de Baieul, called Urselius by Anna Comnena) (died 1077), also known as Phrangopoulos (literally "son-of-a-Frank"), is a Norman adventurer (or exile) who travelled to Byzantium and there receives employ as a soldier and leader of men from the Emperor Romanus IV (ruled 1068–71)