Who takes over Robert Guiscard's forces when he dies as noted in the nonfiction book, The Alexiad of Anna Comnena?

Bohemund wass the son of Robert Guiscard, who took over Robert's forces when he died. He led the second Norman invasion against Alexius and the Byzantines but failed. When he and Alexius made peace, Bohemund joined him in the First Crusade. When he took Antioch, however, he refused to yield to Alexius.