Isabel of Beaumont

Isabel de Beaumont, Duchess of Lancaster
Spouse(s)	Henry of Grosmont, 1st Duke of Lancaster
Noble family	Brienne
Father	Henry de Beaumont, Earl of Buchan
Mother	Alice Comyn
Born	c. 1320
Died	1361

Isabel de Beaumont, Duchess of Lancaster, of the House of Brienne (c. 1320 – 1361) was an English noblewoman, being the youngest daughter and child of Henry de Beaumont, Earl of Buchan and Alice Comyn.

Isabel was born in about 1320. She had nine older siblings, including John de Beaumont, 2nd Lord Beaumont. Isabel's paternal grandparents were Louis of Brienne, Viscount de Beaumont, and Agnes, Viscountess de Beaumont. Her maternal grandparents were Alexander Comyn, Sheriff of Aberdeen and Joan le Latimer.

She married Henry of Grosmont, 1st Duke of Lancaster in 1337. Isabel bore Henry two daughters who would eventually inherit their father's estates:

Isabel died of the plague in 1361 at Leicester Castle. She was buried in Newark Abbey, Leicester. Her husband also died of the plague in March 1361.

Through Blanche, Isabel was an ancestress of Englands's Royal House of Lancaster, with Henry IV of England being her grandson. Philippa of Lancaster, Queen of Portugal and the Algrave and Elizabeth of Lancaster, Duchess of Exeter was also her grandchildren.

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