Brendan of Clonfert Brénainn moccu Alti or Brénainn maccu Alti, also referred to as "Brendán moccu Altae", called "the Navigator", "the Voyager", "the Anchorite", and "the Bold", is one of the early Irish monastic saints and one of the Twelve Apostles of Ireland. He is primarily renowned for his legendary quest to the "Isle of the Blessed", also denominated "Saint Brendan's Island". The Navigatio Sancti Brendani Abbatis can be described as an immram, i. e., Irish navigational narrative.
Saint Brendan's feast day is celebrated on 16 May by Catholics, Anglicans, and Orthodox Christians.