Saint Carthage the Elder (or Carthach) was an Irish bishop and abbot in the sixth century.
[1] Carthage was of the Eóganacht Chaisil and son, or, more probably, grandson of Óengus mac Nad Froích whom Saint Patrick baptized.
He was sent by St. Ciaran upon a penitential pilgrimage, when he spent seven years abroad, visiting Gaul and Rome.
On completion of his canonical penance, Carthage was reinstated as a member of the religious brotherhood of Saighir.
There is a short paragraph about St. Cartha in The Martyrology of Donegal: a Calendar of the Saints of Ireland (1864) by James Michael O'Clery, page 65: Carthach, Bishop, alumnus of Ciaran of Saighir.