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Mac Reithe of Kilmacrehy
Mac Croidhe Ailbh (Ó Riain, Dictionary, 421); Mac Creiche (ibid)
Mac Reithe's name historically meant ‘ram’s son’ but it came to be understood both as Mac Creiche ‘son of plunder’ and also as Mac Croidhe Ailbh ‘ son of Ailbhe’s heart’. The genealogy attached to Mac Reithe son of Ainghin (Mac Reithe m. Angáin, CGSH 695) probably relates to the same cult. His feast day is sometimes given as 11th Aug (eg Mart. Do.), but this is a mistake. The saint of 11 Aug is ‘a cook named ‘Mac Rith’, who reputedly served Mochta of Louth’ (Ó Riain, Dictionary, 420-23).
Source for saint
A Dictionary of Irish Saints
Saint in place-names
Though no place-name referring to this particular saint has been identified, it may be that some of the places dedicated to the non-specific group to which he/she belongs may in fact refer to him/her. Please check the non-specific group.