The Magna Charta Sureties, 1215 : The Barons Named and Some of @ line 149B pp 155-156, lists her grandson Wm de Braose VII, as a
descendant of her father Llywelyn ap Iorwerth & "presumably"
Joan of England

The cited information was published by Genealogical Publishing, Baltimore, MD, 1991? 1979? (Ref: line 149B pp 155-156, lists her grandson Wm de Braose VII, as a
descendant of her father Llywelyn ap Iorwerth & "presumably"
Joan of England) The author/originator was Frederick Lewis Weis.

• Source Notes

  TITL The Magna Charta Sureties, 1215 : The Barons Named and Some of
  Their Descendants Who Settled in America, Pages: 182ABBR Magna Charta Sureties, 4th ed.

• References (2)
  • Parent Source: The Magna Charta Sureties, 1215 : The Barons Named and Some of
  • Individual: Marared Drwyndon verch Llywelyn Fawr