Iorwerth Drwyndwn ap Owain Gwynedd Prince of North Wales
- Marriage (1): Marared ferch Madog ap Maredudd 
 
- Died: Abt 1174
 
 
   Other names for Iorwerth were Iorwerth ap Owain Gwynedd Prince of North Wales and Iorwerth ap Owen Gwynedd Prince of North Wales.  
  Research Notes:  
Source: A History of Wales by John Davies, London, 2007, p.80 and Wikipedia - Llywelyn the Great and 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 married Marared ferch Madog ap Maredudd, daughter of Madog ap Maredudd ap Bleddyn Ruler of Powys and Susanna ferch Gryffydd ap Cynan.  
 
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