| Roger de Mortimer * of March | Philippa de Montacute | Lionel of Antwerp * of Ulster * of Clarence | Isabella de Burgh |
| Edmund III. de Mortimer * of March * of Ulster | Philippa of Clarence | ||
| Roger 4th Earl, Earl Mortimer * of March * of Ulster*1.9.1373/11.4.1374, +(20.7./15.8.)1398 |