Ibar of Beggerin was a 6th-century Irish bishop of noble descent from the Ui Echach tribe. He is often identified as one of the four sacred bishops who lived in Ireland around the time of Saint Patrick. After receiving education at a druidic school, he traveled to Armorica to study the teachings of Martin of Tours, spending time at Lérins Abbey. He eventually established religious communities on the Aran Islands and later in County Offaly before settling at Beggerin, where he founded an oratory and a cell.