He lived in the Kingdom of Dyfed and is principally notable as being the father of Saint Teilo.

His name appears in many forms in surviving texts, but seems to have been derived from the Latin name Auxilius.

[1] The oldest genealogies present him as also the father of Saint Cynllo.

[2] He is 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.

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