Ann de Berkeley was the daughter of Maurice de Berkeley and Isabel Mead (born 1445 Bristol, England)
Maurice Berkeley was the son of Baron J. Berkeley (born 1394) and Isabel Mowbray. Isabel Mowbray was the daughter of Duke of Norfolk (born 1360 Mowbray) and Elizabeth Fitzalan (born 1360).
Baron J. Berkeley was the son of James de Berkley (born about 1360) and Elizabeth Bluet.