 Paul the Deacon recounts the reigns of Grasulf and his successor Ago very briefly, but they continued the war against the Byzantines and Opitergium was conquered in 642.Duke Lupus undertook an expedition against Grado in 662, in which he sacked the city and seized the treasures of the Patriarchate of Aquileia himself.The Duke was very closed with Grimoald (now King of the Lombards), who entrusted him with his palace in Pavia when he went away to Benevento, but in 663 Lupus rebelled.