Susanna ferch Gryffydd ap Cynan
- Marriage: Madog ap Maredudd ap Bleddyn Ruler of Powys
 Research Notes:
Source: Ancestral Roots of Certain American Colonists Who Came to America before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr, ed. by William R. Beall & Kaleen E. Beall, Baltimore, 2008, Line 176B-26 (Iorwerth Drwyndwn) - "Note error in Dict. of Welsh Biog.which shows Susanna as dau. of Owen Gryffydd. Correct father shown in CNB, etc."
Sister of Owain I Gwynedd, by a different mother (half sister)
Susanna married Madog ap Maredudd ap Bleddyn Ruler of Powys, son of Maredudd ap Bleddyn and Unknown. (Madog ap Maredudd ap Bleddyn Ruler of Powys died in 1160.)
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