After Melus's defeat in 1011, Guaimar was paid a visit by the victorious Byzantine catapan, Basil Mesardonites, in October.
When Henry died in 1024, Guaimar sent an embassy to the new emperor, Conrad II, to plead for the release of his brother-in-law Pandulf IV of Capua, the Wolf of the Abruzzi.
Upon his return, Pandulf immediately put his old capital, Capua, under siege, an endeavour in which he had the support of Guaimar and his Normans under Ranulf Drengot and the catepan of Italy, Boioannes.
It was this son, also named Guaimar, who succeeded him in 1027 at the age of fourteen or sixteen under the regency of Gaitelgrima, who was basically the pawn of her brother Pandulf.
Guaimar III's second son, Guy, was made gastald of Capua by his uncle and later duke of Sorrento by his elder brother.