Peter I (born c. 1068, –74—died Sept. 28, 1104) was the king of Aragon from June 1094. The son of Sancho Ramírez, the third in order of the historic kings of Aragon, Peter belonged to times anterior to the authentic written history of his kingdom; and little is known of him save that he conquered Huesca (1096) and Barbastro (1100) from the Moors of Saragossa. He was twice married but left no children and was succeeded by his brother Alfonso I.