About Cadwgan ap Llywarch
Rhodri Mawr, (Rhoderick the Great), King of all Wales, began to reign A. D. 843, and fell in battle A. D. 876. From him were descended, (besides others,) Owen Gwynnedd, Prince of Wales, A. D. 1136, and — Llowarch up Bran, Lord of Monau (Menai), and founder of the II. noble tribe of North Wales and Powys. They were brothers-in-law, their wives being sisters.
Llowarch ap Bran was succeeded by his son, Meredydd, who married his cousin, Gwenillian, granddaughter of Prince Owen Gwynnedd.
Meredydd ap Cadwgan ap Llowarch, ap Bran, of Bodorgan, whose descendant—Eva, daughter of Meredydd ap Cadwgan, of Bodorgan, his only child and heiress, married Einion Sais