Tyfaelog was a 6th-century saint of Wales.Baring-Gould, Sabine. The Lives of the Saints, Vol. XVI, "The Celtic Church and its Saints", Longmans, Green, & Co. (New York), 1898.Vol. I, p. 70. The saint is connected to a small area near Brecon south Powys where there are two churches: Llandyfaelog Tre'r-graig and Llandyfaelog Fach.
There is also a church in Llandyfaelog, between Kidwelly and Carmarthen (Carmarthenshire).Tyfaelog is recorded as being the son of Gildas.
A feast day is celebrated in his honour on 1 March at Llandyfaelog Tre'r-graig and on 26 February at Llandyfaelog, Ystrad Tywi.
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