Harwyn Hoare invaded the Riverlands during the reign of King Arrec Durrandon. Lothar's neighbour, Lady Agnes Blackwood, led the armies of the Riverlords. Lothar, however, attacked her from behind and delivered Agnes and two of her sons to Harwyn. Some theorize that Lothar wanted to become King of the Trident after Harwyn defeated Arrec, but the former took the title for himself. Lothar led a rebellion against Harwyn some years later, but he was defeated, Stone Hedge was burned, and Lothar himself was starved to death in a crow cage.