Bloodline of the Holy Grail; the Hidden Lineage of Jesus @ p 185, s of Cadfan ap Iago King of Gwynedd & Acha of Deira, d of Aelle of Deira
The cited information was published by Element Books, 1996 (Ref: p 185, s of Cadfan ap Iago King of Gwynedd & Acha of Deira, d of Aelle of Deira) The author/originator was Laurence Gardner.