His daughter, Theodora, married Pandulf (or Landulf), lord of Capaccio (1040–1052), son of Guaimar III of Salerno and Gaitelgrima and brother of Guaimar IV, with whom he was assassinated.
Guaimar II was the duke of Amalfi, ruling alongside his father, Manso II, and under the suzerainty of his namesake, Guaimar IV of Salerno, from 1047, when his father first associated him, to his and his father's deposition in 1052 by his uncle, John II, after the assassination of the prince of Salerno.
At a synod in Benevento in July 1051, Pope Leo IX beseeched Guaimar and Drogo to stop the Norman incursions on church lands.
The cruelty of this act turned the citizenry against the duke and duchess and, in April 1039, they ousted John and Maria and accepted Guaimar IV of Salerno as duke.
Salerno | Nadja Salerno-Sonnenberg | Guaimar IV of Salerno | Salerno railway station | Sabrina Salerno | Guaimar III of Salerno | Province of Salerno | Gulf of Salerno | University of Salerno | Roman Catholic Archdiocese of Salerno-Campagna-Acerno | Roger of Salerno | province of Salerno | Pandulf II of Salerno | Nicola Salerno | Gisulf II of Salerno | Gaitelgrima, daughter of Guaimar IV | Anthony "Fat Tony" Salerno | Al Salerno |
Robert founded the importance of his fief by marrying Gaitelgrima, daughter of Guaimar IV of Salerno and Drogo of Hauteville, the two most powerful south Italian lords of the day.