Joscelin (or Jocelyn) was a Norman count of Molfetta on the Adriatic coast of southern Italy. He rejected the leadership of Duke Robert Guiscard and rebelled, perhaps as early as 1064, certainly by 1067. Defeated, he went over the Byzantines in 1068. There is some evidence Joscelin was given a command in Greece. In 1071, he led a fleet to relive the Norman siege of Bari but was intercepted and captured. He ended his life in captivity. Through his daughter, name unknown, his descendants continued to rule Molfetta into the next century.