|Iorwerth ap Madog of Penllyn
Iorwerth ap Madog of Penllyn 1
Another name for Iorwerth was Iorwerth of Penllyn.
From History of Powys Fadog, vol. 6, p. 120:
Iorwerth married Gwervyl verch Cynwrig ap Pasgen, daughter of Cynwrig ap Pasgen ap Gwyn and Unknown.
Lloyd, Jacob Youde William, The History of the Princes, the Lords Marcher, and the Ancient Nobility of Powys Fadog (Vol. 6. London: Whiting & Co., 1887.), p. 120.