Ciarán of Saigir

Ciarán of Saigir (; 5th century – ), also known as Ciarán mac Luaigne or Saint Kieran , was one of the Twelve Apostles of Ireland and is considered the first saint to have been born in Ireland, although the legend that he preceded Saint Patrick is questionable. Ciarán was bishop of Saighir (Seir-Kieran) and remains the patron saint of its successor, the diocese of Ossory.

His feast day is celebrated on 5 March. He is sometimes called Saint Ciarán the Elder ( or Ciaranus Maior) to distinguish him from the other 6th-century Irish Saint Ciarán, who was abbot of Clonmacnoise. He shares the feast date of 5 March with his mother, St. Liadán, and his disciple and episcopal successor, St. Carthach the Elder.

His identity is sometimes equated with that of Saint Piran.