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.
Around 1058, he tied the knot with Maria, the child of Guy, Duke of Sorrento, and brother of Guaimar IV of Salerno. He acquired all Guy's holdings in the principality of Salerno and engaged in a struggle with Gisulf II, whose territories he gradually diminished until only Salerno remained.