Aneurin, the author of this poem, was the son of Caw, lord of Cwm Cawlwyd, or Cowllwg, a region in the North, which, as we learn from a Life of Gildas in the monastery of Fleury published by Johannes a Bosco, comprehended Arecluta or Strath Clyde. {0a} Several of his brothers seem to have emigrated from Prydyn in company with their father before the battle of Cattraeth, and, under the royal protection of Maelgwn Gwynedd, to have settled in Wales, where they professed religious lives, and became founders of churches