Mary Owen's mother was Isabel (1530c-1580c), the daughter of Sir William Griffith (1510c-1560c) of Penrhyn. The Griffith's of Penrhyn were one of the most powerful families in North Wales at the time and were a branch of the Tudor family descended from Ednyfed Fychan (d. 1246) and the Welch royal and princely house, including Rhodri Mawr (Rhodri the Great) (d. 878) and Cadwaladr the Blessed (d. 688).
Sir William Griffith's parents were Sir William Griffith (c1475-1531) and his 2nd wife Jane Stradling (d/o Thomas of St. Donat's Castle (now the world famous Atlantic College), Glamorgan and Jane Mathew). His grandparents were Sir William Griffith (c1445-c1505), and Joan Thoutbeck, Lord of Penrhyn Castle; Chamberlain of North Wales, who fought at Bosworth (1485) for Henry VII, his cousin. His great grandparents were Sir William Fychan ap Gwillym (1420-1483) and Alice Dalton, who was also Chamberlain of North Wales.
Source: Wanda DeGidio
Ancestry/Barbara Carpenter Martin
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Knight of Penrhyn Castle, co. Caernarvon; Chamberlain of North
Wales; High Sheriff of Caernarvonshire, 1493-4; made knight
banneret by King Henry VIII at Therouanne, 25 Dec 1513; son and
heir.
Ancestry/Thomas Lester McKibbin
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Ancestry/Patricia Ransom