William The Brown (3rd Earl of Ulster) De Burgh
1312 - 1333 (21 years)
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| Roger (4th Earl of March) Mortimer | |
| B: | 1 Sep 1373 |
| D: | 20 Jul 1398 |
| Battle In Ireland | |
| Eleanor\Alianore (of Kent) Holland | |
| B: | Abt 1373 |
| D: | 1405 |
| Elizabeth (of March) Mortimer | |
| B: | 12 Feb 1370-1371 |
| D: | 20 Apr 1417 |
| Thomas (1st Lord Camoys) De Camoys | |
| D: | 28 Mar 1421 |
| Sir Henry (Hotspur) Percy | |
| B: | 20 May 1364 |
| M: | Bef 10 Dec 1379 |
| D: | 21 Jul 1404 |
| Battle Of Shrewsbury | |
| Philippa (of March) Mortimer | |
| B: | 21 Nov 1375 |
| D: | 1401 |
| John (Earl of Pembroke) Hastings | |
| D: | Yes, date unknown |
| Thomas of Basing (Lord St John) Poynings | |
| D: | Yes, date unknown |
| Richard (11Th\4th Earl of Arundel) Fitzalan | |
| B: | 1346 |
| M: | 15 Aug 1390 |
| D: | 21 Sep 1397 |
| Beheaded | |
| Edmund (Sir) Mortimer | |
| B: | 9 Nov 1376 |
| D: | 1409 |
| Glendour | |
| D: | Yes, date unknown |
| John (Sir) Mortimer | |
| D: | Yes, date unknown |
| Phillippa (Countess of Ulster) Plantagenet | |
| B: | 16 Aug 1355 |
| D: | 5 Jan 1377-1378 |
| Edmund (3rd Earl of March) De Mortimer | |
| B: | 1351 |
| M: | 1368 |
| D: | 27 Dec 1381 |
| Elizabeth (Countess of Ulster) De Burgh | |
| B: | 6 Jul 1332 |
| D: | 10 Dec 1363 |
| Lionel of Antwerp (Duke of Clarence) Plantagenet | |
| B: | 29 Nov 1338 |
| M: | 9 Sep 1342 |
| D: | 1368 |
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| William The Brown (3rd Earl of Ulster) De Burgh | |
| B: | 1312 |
| D: | 6 Jun 1333 |
| Maud Plantagenet | |
| B: | Abt 1310 |
| M: | 1 May 1327 |
| D: | 1377 |