Saint Fiacc was a 5th-century Irish poet and the chief bishop of Leinster. Born to a prince of the Uí Bairrche and a sister of the Chief Ollam of Ireland, he was trained in the bardic tradition by his uncle. Following the arrival of Saint Patrick in the region, Fiacc was chosen to serve as the dedicated bishop for the converts of Leinster. He was noted for his rapid acquisition of learning and eventually established significant religious foundations in the province.