His name appears in many forms in surviving texts, but seems to have been derived from the Latin name Auxilius.
The Book of Llandaff gives his wife as Guenhaf daughter of Liuonui. He was the father of Saint Teilo and the Anauved who married King Budig of Armorica and bore three saints. The oldest genealogies present him as also the father of Saint Cynllo.
He was the patron saint of the parish church at Saundersfoot (Old Welsh: Llanussyllt) but probably not the patron of Haroldston St Issells which was probably corrupted from an original dedication to his grandson Saint Ismael.
- Baring-Gould, Sabine & al. The Lives of the British Saints, Vol. 4, p. 348 f. Kessinger Publishing, 2005. Accessed 26 Mar 2013.
- Alonso, Justo Fernandez. "San Cynllo//", Santi e Beati, June 11, 2008
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