Nephew of Duke Gerard of Vienne and kin to Sir Oliver, Aymeriet made a name for himself before he was even knighted when he attacked Carloman’s wife, Gerbirga, for the trick she played on the Duke. This affront led directly to the siege of Vienne in 770-71. Aymeriet was knighted during the siege, and nearly succeeded in capturing Queen Gerbirga during a particularly bloody sortie.

After Roland and Oliver fought to a draw outside the walls of the city, the siege was lifted and Aymeriet renewed his oath of fealty to King Carloman.