Family: Edmund ( 3rd Earl of March and 7th Earl of Ulster) DeMortimer / Philippa Plantagenet

Maternal line Edmund ( 3rd Earl of March and 7th Earl of Ulster) DeMortimer
Philippe (Philippa) DeMontagu 1332 - 1382  (50 years)	_	Roger DeMortimer 1328 - 1360  (31 years)
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Katherine DeGrandison (maid. name 1) 1302 - 1349  (47 years)	_	Sir William ( 3rd Baron Montacute, 1st Earl of Salisbury, and King of Mann) De Montagu 1301 - 1334  (33 years)

Maternal line Philippa Plantagenet
Elizabeth Duchess of Clarence Countess of Ulster BURGH 1332 - 1363  (31 years)	_	Lionel ( 1st Duke of Clareance) Plantagnant 1338 - 1368  (29 years)