Carláen was a 6th-century Irish priest and bishop who served as the leader of Armagh from 578 until his death in 588. Born around 530 to the Uí Nialláin clan, he likely received an elite education due to his noble lineage. Before his elevation to the episcopacy, he established a monastery in Oneilland, where he served as abbot. His family's historical connection to the land of Armagh is thought to have influenced his appointment as the twelfth successor to Saint Patrick.