Son of Vortigern and brother of Vortimer, Catigern, and Faustus. Nennius mentions that after his father’s death, he was granted the rule of Buelt and Gwerthrynion by the new king, Ambrosius. Geoffrey, however, contends that Pascentius fled to Germany, raised an army, and returned to Britain to attack Ambrosius. After one defeat, he allied with King Gilloman of Ireland and tried again. He sent a Saxon assassin named Eopa to kill Ambrosius, and the Saxon succeeded. Uther and his army met Pascentius and Gilloman near St. David’s (or at Menevia) and killed them. Wace says that Pascentius hated his father because of his father’s dealings with the Saxons. Thomas Heywood erroneously makes him a Saxon.