Tyfaelog was a 6th-century saint of Wales.[1][2] The saint is connected to a small area near Brecon south Powys where there are two churches: Llandyfaelog Tre'r-graig[2] and Llandyfaelog Fach.
There is also a church in Llandyfaelog, between Kidwelly and Carmarthen (Carmarthenshire).Tyfaelog is recorded as being the son of Gildas.[3]
Afeast day is celebrated in his honour on 1 March at Llandyfaelog Tre'r-graig and on 26 February at Llandyfaelog, Ystrad Tywi.