 Broken in spirit, Sergius retired to the monastery of the Holy Saviour "in insula maris", where the Castello del'Ovo now stands.He was succeeded by his son, John V. When John went to Constantinople seeking aid from the Byzantines, Sergius briefly came out of retirement to act as regent.On John's return, Sergius returned to his monastery, where he was still living as late as June 1036.