It is a reasonable conjecture that Ingenuus may have been the founder of the church in the late fifth century, and that St. Tanwg lived at this llan a generation or two later.

It is inscribed Equestrinomine, an unusual form of wording otherwise known only from 4th century inscriptions in Italy and Gaul.

[3] Saint Tanwg is said to have been the son of Ithel the Generous of Armorica and the cousin of St Cadfan.

St Cadfan reportedly was one of the founders of the college of Bardsey as a monastery in 516 AD and to have been Abbot there until 542.

Baglan, Trillo, Tegai, Twrog, Tecwyn, Gredifael, Flewyn and Llechid, and is commemorated 10 October.