| | Roger Grenville 1477–1524 | | |
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| | Thomas Grenville 1426–1483 Elizabeth Gorges 1400–1470 | | |
| | Phillipa Bonnville 1405–… | | |
| | Theobald Grenville Sir …–… | | | | Matilda (Maud) Beaumont …–1467 | | | | Edward de Courtenay of Godlington 1329–1372 | | | | Hugh de Courtenay 2nd Earl of Devon 1303–1377 Margaret de Bohun 1311–1391 | | | | Hugh de Courtenay 1273–1340 | | |
| | | Humphrey de Bohun Earl of Essex & 4th Earl of Hertford 1275–1321 Elizabeth Plantagenet …–1316 | | |
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| | | John Beaumont Lord Beaumont …–1342 Eleanor Plantagenet of Lancaster …–1372 | | | | Henry Beaumont Earl of Buchan 1288–1340 | | | | | Alexander Comyn Sheriff of Aberdeen 1270–… | | |
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| | | Henry Plantagenet 3rd Earl of Leicester and Lancaster 1281–1345 Maud de Chaworth 1282–1322 | | | | Edmund Crouchback Plantagenet 1st Earl of Leicester and Lancaster 1245–1296 | | |
| | | Patrick de Chaworth Lord of Kidwelly …–… Isabella de Beauchamp 1236–1306 | | |
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