Passage: In 1024, Norman mercenaries under Ranulf Drengot were in the service of Guaimar III when he and Pandulf IV besieged Pandulf V in Capua. In 1026, after an 18-month siege, Capua surrendered and Pandulf IV was reinstated as prince. During the next few years Ranulf would attach himself to Pandulf, but in 1029 he joined Sergius IV of Naples (whom Pandulf expelled from Naples in 1027, probably with Ranulf's assistance).

Question: Who did Ranulf join after Pandulf?
Sergius IV