King of Aragon and Navarre since the year 1094 to the 1104, born in the year 1074. Son and successor of Sancho Ramírez. It was as a friend and ally to the Cid Campeador, Lord of Valencia. Mostain II, Arab King of Zaragoza, ally of the Castilians in the battle of Alcoraz, defeated was delivered with what the city of Huesca, in 1096. In 1101 he/she conquered Barbastro. His brother Alfonsosucceeded him, called el Batallador, because Pedro I left no offspring despite his two marriages, with Agnes of Aquitaine first and an Italian lady named Berta, of which little is known, then.