John (Lord Okehampton) De Courtenay
- 1274Drag or scroll to see more of the chart.
| Richard (2nd Lord Grey of Condor) De Grey | |
| D: | 1335 |
 | Joan Fitzpayn -Aft 1335 |
| Joan Fitzpayn | |
| D: | Aft 1335 |
| Eleanor De Courtenay -Yes, date unknown |
| Eleanor De Courtenay | |
| D: | Yes, date unknown |
| Henry (1st Lord Grey of Condor) De Grey | |
| D: | 1308 |
| Hugh (2nd\10Th Earl of Devon) Courtenay 1303-1377 |
| Hugh (2nd\10Th Earl of Devon) Courtenay | |
| B: | 12 Jul 1303 |
| D: | 2 May 1377 |
| Margaret De Bohun 1311-1391 |
| Margaret De Bohun | |
| B: | 3 Apr 1311 |
| M: | 11 Aug 1325 |
| D: | 16 Dec 1391 |
| Hugh (Earl of Devon) De Courtenay 1274-1340 |
| Hugh (Earl of Devon) De Courtenay | |
| B: | 1274 |
| D: | 23 Dec 1340 |
| Agnes De St John -1345 |
| Agnes De St John | |
| D: | 11 Jun 1345 |
| Margaret De Courtenay -Yes, date unknown |
| Margaret De Courtenay | |
| D: | Yes, date unknown |
| Nicholas (2nd Lord Moels) De Moels -Bef 1315 |
| Nicholas (2nd Lord Moels) De Moels | |
| M: | Bef Feb 1312 |
| D: | Bef 29 Jan 1315 |
| Dsp | |
| Margaret (of Basing) St John Abt 1308-1361 |
| Margaret (of Basing) St John | |
| B: | Abt 1308 |
| D: | 19 Nov 1361 |
| John (2nd Lord of Hacche) De Beauchamp Aft 1304-1343 |
| John (2nd Lord of Hacche) De Beauchamp | |
| B: | Aft 4 Oct 1304 |
| D: | 19 May 1343 |
| Isabel St John 1333-1393 |
| Isabel St John | |
| B: | 29 Jun 1333 |
| D: | 16 Oct 1393 |
| Henry De Burghersh -Yes, date unknown |
| Henry De Burghersh | |
| M: | Abt 1347 |
| D: | Yes, date unknown |
| Luke (of Basing 1st Lord 'St. John) De Poynings | |
| M: | Bef 29 Jan 1349 |
| D: | Bef 4 Jul 1376 |
| Isabel (of Okehampton) Courtenay -Yes, date unknown |
| Isabel (of Okehampton) Courtenay | |
| D: | Yes, date unknown |
| John (of Basing 1st Lord) De St John Abt 1273-Bef 1329 |
| John (of Basing 1st Lord) De St John | |
| B: | Abt 1273 |
| M: | Bef 1308 |
| D: | Bef 4 Apr 1329 |
| Hugh (Sir) (of Okehampton) De Courtenay | |
| D: | 28 Feb 1290-1291 |
| Eleanor Le Despenser -Aft 1315 |
| Eleanor Le Despenser | |
| D: | Aft Mar 1315 |
|
| John (Lord Okehampton) De Courtenay | |
| D: | 3 May 1274 |
| Isabel De Vere -Yes, date unknown |
| Isabel De Vere | |
| D: | Yes, date unknown |