Éogan of Ardstraw was a 6th-century Irish monk and missionary. Born in the region of Leinster, he was captured by pirates during his youth while studying at Clones Abbey and taken to Brittany. After regaining his freedom, he pursued further education at Candida Casa. He eventually returned to Ireland, establishing a foundation at Kilnamanagh before moving to the Mourne valley. There, he founded the monastery at Ardstraw and was consecrated as its first bishop around 581.