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Ralph de Mortimer | |
|---|---|
| Born | Before 1198 |
| Died | 6 August 1246 |
| Noble family | Mortimer |
| Spouse | |
Issue | 4, including Roger |
| Father | Roger de Mortimer |
| Mother | Isabel de Ferriers |
Ranulph or Ralph de Mortimer (before 1198 to 6 August 1246) was the second son of Roger de Mortimer and Isabel de Ferrers of Wigmore Castle in Herefordshire. He succeeded his elder brother before 23 November 1227 and built Cefnllys and Knucklas castles in 1240.

In 1230, Ralph married Princess Gwladus, daughter of Llywelyn ab Iorwerth and Joan, Lady of Wales (the only acknowledged, illegitimate daughter of John, King of England). They had the following children: