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Gwenwynwyn ab Owain Cyfeiliog (died c. 1216) was the last major ruler of mid Wales before the completion of the Norman English invasion. He was one of few native rulers to represent a real threat to the rule of Llywelyn the Great.
- ^ Williams, Richard (1887). The royal tribes of Wales; To which is added an account of The fifteen tribes of north Wales. With numerous additions and notes, preface and index. Liverpool I. Foulkes. Unknown ID AFV-0947.