Sergius IV of Naples (died 1036) was Duke of Naples from 1002 to 1036, succeeding John IV and preceding John V.
Biography[]
Sergius was the son of Duke John IV of Naples, and he acceded to the duchy of Naples in 1002, serving as a Byzantine vassal. In 1024, he submitted to the Holy Roman Emperor Henry II during his invasion of southern Italy, and, in 1026, he allowed for the fellow Imperial vassal Pandulf V of Capua to flee to his court after the Byzantines and Normans helped Pandulf IV of Capua reclaim his throne. Pandulf IV then besieged Naples, but, in 1029, the Normans under Rainulf Drengot betrayed Pandulf IV rather than let him become too powerful. The Normans forced Pandulf IV to return to Capua, and Sergius IV rewarded the Normans by granting them the County of Aversa. In 1034, Sergius annexed Sorrento after provoking a revolt there, but he retired to the Castel Dell'Ovo when Rainulf returned to Pandulf IV's side. He briefly came out of retirement to serve as regent for his son John V of Naples, and he died in 1036.