In April 1064, Abelard joined three discontented barons (Geoffrey I of Conversano; Joscelin, Lord of Molfetta; and Robert, Count of Montescaglioso) in rebellion against Robert, who had just left for Sicily. They received the aid, financial and military, of Perenos, the Byzantine duke of Durazzo, and held out for several years, neither making headway against Robert nor he against them.
Abelard joined forces with three disgruntled noblemen (Geoffrey I of Conversano; Joscelin, Lord of Molfetta; and Robert, Count of Montescaglioso) in a rebellion against Robert, who had recently left for Sicily. They received support from Perenos, the Byzantine duke of Durazzo, and resisted for several years, with neither side gaining an advantage.