She is believed to be a daughter of the Welsh King Brychan, and a native of South Wales who travelled to North Cornwall to join her siblings in converting the locals to Christianity.

[3] The saint is believed to have been a native of South Wales who crossed the Bristol Channel to join her siblings in converting the people of North Cornwall to Christianity.

During her journey, she initially landed on the island of Lundy, where she is believed to have founded a small chapel, which would later be wrongly rededicated to Saint Helen.

[3] Her sister, St Dilic (whose church is at Landulph), settled nearby and the two would often meet along a certain path whose grass would ever afterwards grow greener than elsewhere.

[5] Endellion is depicted in the Langdale rosary, a 16th Century work believed to have belonged to Lord William Howard; it is now in the Victoria and Albert Museum.