The saint is said to
have been born about A.D. 527,
and to have been the son of Ewen ap Urien, a prince of Strathclyde, his
mother being Thenaw, a daughter of Loth, King of Northumbria, which
kingdom then extended along the eastern coast, from the Firth of Forth, or
Scots Sea, as it was long named, to the Firth of Tyne.
The mother of St. Thenaw is said to
have been either an aunt or
half-sister of the famous King Arthur. The saint was thus cousin to King
Arthur, and sister to the "gentle Gawaine", so renowned as one of the
chief knights of the Round Table.