PHILLIPPA PANTAGENET, 5th Countess of Ulster was born August 16, 1355 in Eltham Palace, Kent, England, United Kingdom and died January 5, 1382 in County Cork, Ireland https://en.wikipedia.org/wiki/Philippa,_5th_Countess_of_Ulster
She married EDMUND MORTIMER, 3rd Earl of March in 1368. he was born in 1352 in Llyswen, Brecknickshire, Wales, United Kingdom and died December 27, 1381 in Cork Ireland https://en.wikipedia.org/wiki/Edmund_Mortimer,_3rd_Earl_of_March
Children of PHILLIPPA PANTAGENET and EDMUND MORTIMER:
b. 1371 Usk, Monmouthshire, Wales
d. 1417
m. HENRY PERCY
b. May 20, 1364 Alnwick Castle, Alnwick, Northumberland England
d. July 21, 1403 Shrewbury, Shropeshire, England
m. THOMAS DE CAMOYS, 1st Baron Camoys
b. 1351
d. 1421
II ROGER MORTIMER, 4th Earl of March
b. April 11 1374, Usk, Monmouthshire, Wales
d. July 20, 1398 Kells, County Meath, Ireland
m. ALIANORE HOLLAND
b. 1373
d. 1405
III. PHILLIPPA MORTIMER
b. November 21 1375 Ludlow Castle, Ludlow, Shropshire, England
d. September 26, 1400 Halnaker, Sussex, England
m. JOHN HASTINGS, 3rd Earl of Pembroke
b. 1372
d. 1389
m. RICHARD FITZALAN, 11th Earl of Arundel
b. 1346
d. September 21, 1397
m. THOMAS POYNINGS, 5th Baron of St John
d. 1429
IV. EDMUND MORTIMER
b. 1376
d. 1400
Philippa Plantagenet, 5th Countess of Ulster, (August 16, 1355 – January 5, 1382), Countess of Ulster suo jure.
Philippa was born in Eltham Palace, Kent, England on August 16, 1355. She was the daughter and only child of Lionel of Antwerp, 1st Duke of Clarence, and Elizabeth de Burgh, 4th Countess of Ulster. Her father was the second son of King Edward III of England by his Queen consort, Philippa of Hainault.
Philippa married Edmund Mortimer, 3rd Earl of March, in 1368 at the age of thirteen in the Queen's Chapel at Reading Abbey, an alliance that would have far-reaching consequences in English history. Her cousin, King Richard II remained childless, making Philippa and her descendants next in line to the throne until his deposition. In the Wars of the Roses the Yorkist claim to the crown based its descent from Edward III through his granddaughter Philippa of Clarence.[3] Philippa was Anne Mortimer's grandmother.
Philippa died in 1378, and was buried at Wigmore Abbey, Herefordshire.
http://familypedia.wikia.com/wiki/Philippa_Plantagenet,_5th_Countess_of_Ulster_(1355-1382)
https://en.wikipedia.org/wiki/Philippa,_5th_Countess_of_Ulster