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Sources differ as to whether Gwladus was Llywelyn's legitimate daughter by his wife Joan or an illegitimate daughter by Tangwystl Goch. Some sources say that Joan gave her lands to Gwladus, which suggests, but does not prove, the former. Gwladus is recorded in Brut y Tywysogion as having died at Windsor in 1251.
|Offspring of Gwladus Ddu and Ralph de Mortimer (bef1198-1246)|
|Roger Mortimer, 1st Baron Mortimer of Wigmore (1231-1282)||<year not a number>||<year not a number>|| Maud de Braose (1224-1300)|
|Hugh de Mortimer||<year not a number>|| Matilda le Meschin (-aft1189)|
|John de Mortimer|| |
|Peter de Mortimer|
Common ancestors of Gwladus Ddu (-1251) and Ralph de Mortimer (bef1198-1246)
- Gwladus Ddu (-1251)
- Joan of England (1190-1236)
- John of England (1167-1216)
- Llywelyn ab Iorwerth (c1173-1240)