Iarlaithe mac Loga, also known as Jarlath, was an Irish priest and scholar from Connacht, remembered as the founder of the monastic School of Tuam and of the Archdiocese of Tuam, of which he is the patron saint. No medieval biography of Jarlath is extant, but sources for his life and cult include genealogies, martyrologies, the Irish Lives of St Brendan of Clonfert, and a biography compiled by John Colgan in the 17th century.

Brendan of Clonfert is one of the early Irish monastic saints and one of the Twelve Apostles of Ireland. He is also referred to as Brendan the Navigator, Brendan the Voyager, Brendan the Anchorite, and Brendan the Bold. The Irish translation of his name is Naomh Bréanainn or Naomh Breandán. He is mainly known for his legendary voyage to find the “Isle of the Blessed” which is sometimes referred to as “Saint Brendan’s Island”. The written narrative of his journey comes from the immram The Navigatio Sancti Brendani Abbatis.