In 1058, he married Maria, the daughter of Guy, Duke of Sorrento and brother of Guaimar IV of Salerno. He inherited all Guy's lands in the principality of Salerno and fought with Guaimar's successor, Gisulf II, whose lands he ate away at until little was left but Salerno itself.
In 1058, he married Maria, the offspring of Guy, Duke of Sorrento, and brother of Guaimar IV of Salerno. He inherited all Guy's domains in the principality of Salerno and battled with Gisulf II, whose territories he gradually diminished until only Salerno remained.