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| 1251 | Birth |  |
| Birth of Edmund Mortimer, 2nd Baron Mortimer, second son and eventual heir of Roger Mortimer, 1st Baron Wigmore |
| 1265 | Treasurer | |
| Appointed Treasurer of York |
| 1276 | Death | |
| The sudden death of his elder brother, Ralph, makes him heir to the family estates |
| 1282 | Peerage | |
| Created Baron Mortimer of Wigmore |
| 1285 | Marriage | |
| Marries Margaret de Fiennes , the daughter of William II de Fiennes and Blanche de Brienne (herself the granddaughter of John of Brienne) |
| 1304 | Death | |
| 17th July Death of Edmund Mortimer, 2nd Baron Mortimer |
| 1351 | Birth | |
| Birth of Edmund Mortimer, 3rd Earl of March, son of Roger Mortimer, 2nd Earl of March, by his wife Philippa, daughter of William Montacute, 1st Earl of Salisbury |
| 1360 | Peerage | |
| London Created Earl of March, 3rd |
| 1368 | Marriage | |
| London Marries Philippa, daughter of Edward III's son Lionel & inherits the earldom of Ulster |
| 1368 | Peerage | |
| London Created Earl of Ulster, 1368-81 |
| 1368 | Succession | |
| London Next in line to the throne after death of father's wife, the Black Prince & his son |
| 1369 | Marshal of England | |
| Appointed Marshal of England |
| 1374 | Birth | |
| Birth of Roger de Mortimer, son of the 3rd Earl of March |
| 1377 | Coronation | |
| Westminster Abbey Bears the sword & spurs at Richard II's coronation |
| 1379 | Lieutenant | |
| Appointed Lieutenant of Ireland |
| 1381 | Death | |
| Death of Edmund Mortimer |
| Kells Death of Edmund Mortimer, gives the House of York the claim to the English throne |
| 1381 | Succession | |
| Kells Death of Edmund Mortimer, gives the House of York the claim to the English throne |
| 1385 | Succession | |
| Proclaimed heir presumptive to the English throne |
| 1388 | Marriage | |
| Marries the niece of King Richard II |
| 1391 | Birth | |
| Birth of Edmund de Mortimer, descended from Edward III via Lionel |
| 1397 | Battle of Kells | |
| Kells Death of Edmund Mortimer, killed in the battle of Kells |
| 1397 | Death | |
| Kells Death of Edmund Mortimer, killed in the battle of Kells |
| 1397 | Lieutenant | |
| Appointed Lieutenant of Ireland |
| 1402 | Battle of Pilleth | |
| 22nd June Pilleth Defeated by Owen Glendower |
| 1402 | Rebellion | |
| Henry IV sends Edmund de Mortimer to Wales to crush the Welsh rebellion |
| 1403 | Rebellion | |
| The Percies plan to join Glendower & support March's claim to the throne |
| 1415 | Plot | |
| 1st Aug Earl March betrays the plotters to the King |
| 1st Aug Henry's cousin leads a plot to assasinate the King and replace him Earl March |
| 1425 | Death | |
| Death of Edmund de Mortimer |
