Lionel of Antwerp (1338 – 1368) 1st Duke of Clarence
- Lionel of Antwerp (1338 – 1368) 1st Duke of Clarence. Married firstly Elizabeth de Burgh (d.1363) 4th Countess of Ulster, daughter of William Donn de Burgh, 3rd Earl of Ulster and secondly Violante Visconti (1354 – 1386) daughter of Galeazzo II Visconti, Lord of Milan and Pavia. See House of Plantagenet
Daughter of Lionel of Antwerp 1st Duke of Clarence and Elizabeth de Burgh:
Philippa of Clarence (1355 – 1382) suo jure Countess of Ulster
- Philippa of Clarence (1355 – 1382) suo jure Countess of Ulster. Married Edmund de Mortimer (1352 – 1381) 3rd Earl of March and jure uxoris Earl of Ulster
Children of Philippa of Clarence and Edmund de Mortimer:
Elizabeth Mortimer (1371 – 1417)
- Elizabeth Mortimer (1371 – 1417) Married firstly Sir Henry Percy (1364 – 1403) and secondly Thomas de Camoys (c. 1351 –1421) 1st Baron Camoys
Roger Mortimer (1374–1398) 4th Earl of March and Ulster
- Roger Mortimer (1374–1398) 4th Earl of March and Ulster. Married Alianore Holland (1373 – 1405) daughter of Thomas Holland (1350 –1397) 2nd Earl of Kent.
Philippa Mortimer (1375–1401)
- Philippa Mortimer (1375–1401) Married firstly John Hastings (1372 – 1389) 3rd Earl of Pembroke, secondly Richard Fitzalan (1346 – 1397) 4th Earl of Arundel, 9th Earl of Surrey and thirdly Thomas Poynings (d. 1428) 5th Baron St John
Edmund Mortimer (1376–1409)
- Edmund Mortimer (1376–1409) Married Catrin ferch Owain Glyndŵr (d. 1413) daughter of Owain Glyndŵr
Children of Roger Mortimer and Alianore Holland:
Anne Mortimer (1388 – 1411)
- Anne Mortimer (1388 – 1411) Married Richard of Conisburgh (1385 – 1415) 3rd Earl of Cambridge. See House of York.
Edmund Mortimer (1391 – 1425) 5th Earl of March and Ulster
- Edmund Mortimer (1391 – 1425) 5th Earl of March and Ulster. Heir presumptive to Richard II, King of England. Married Anne Stafford (d. 1432) daughter of Edmund Stafford, 5th Earl of Stafford. No issue
Eleanor Mortimer (1395 – 1422)
- Eleanor Mortimer (1395 – 1422) Married firstly Sir Edward de Courtenay (d.1418) and secondly Sir John Harpeden (d.1438)