Roger MORTIMER, 1st Earl of March
1287 - 1330 (43 years)
| First Cousins | |
|---|---|
| 1 | Thomas DE VERE d. 1308 |
| 2 | Sir Richard FITZALAN, 1st Earl of Arundel , b. 3 Feb 1267 d. 9 Mar 1302 |
| Second Cousins | |
|---|---|
| 1 | John DE BOHUN, 5th Earl of Hereford
, b. 23 Nov 1306, St. Clement's, Oxford, Oxfordshire, England  d. 20 Jan 1336 |
| 2 | William DE BOHUN, 1st Earl of Northampton , b. Abt 1312 d. 16 Sep 1360 |
| Third Cousins | |
|---|---|
| 1 | Henry DE PERCY, 1st Baron Percy
, b. 25 Mar 1273, Petworth, Sussex, England d. Oct 1314 |
| 2 | Sir John DE WARENNE, 7th Earl of Surrey , b. 30 Jun 1286 d. Jun 1347 |
| 3 | Alice DE WARENNE, Countess of Arundel , b. 15 Jun 1287 d. 23 May 1338 |