Branches of the Cornwall family
- 1st Earl of Cornwall 1209–1272 Joan de Valletort 1214–1267
- Richard “Earl of Cornwall” de Cornwall 1252–1280 Joan St. Owen 1260–1316
- Joan de Cornwall 1286–1342 Sir John Howard 1276–1331
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- Joan de Cornwall 1286–1342 Sir John Howard 1276–1331
- Richard “Earl of Cornwall” de Cornwall 1252–1280 Joan St. Owen 1260–1316