Peter I of Aragon

Peter I (c. 1068–1104), eldest son of Sancho Ramírez and Isabella of Urgell, ruled Sobrarbe and Ribagorza as a sub-king from 1085 before succeeding his father as king of Aragon and Pamplona in 1094.

He pressed the Reconquista south, routing the Taifa of Zaragoza at Alcoraz and capturing Huesca in 1095. Beside El Cid he defeated an Almoravid army at Bairén in 1096. He died on 28 December 1104, and his brother Alfonso the Battler succeeded him.