Shortly before 14 July 1310, Alice married Henry de Beaumont, Lord Beaumont, the son of Louis de Brienne, Viscount de Beaumont and Agnes, Viscountess de Beaumont. Upon her marriage she was styled as
Lady Beaumont. Henry was a key figure in the Anglo-Scottish wars of the 13th and 14th centuries. (See main article:
Wars of Scottish Independence) As a consequence of her marriage to Henry, Alice had become, in Scottish eyes, irretrievably English, therefore the Scots recognised her sister Margaret's right to the Earldom of Buchan rather than her own. The marriage produced many children: • Katherine de Beaumont (died 11 November 1368), married
David III Strathbogie,
Earl of Atholl, by whom she had issue. • Elizabeth de Beaumont (died 27 October 1400), married
Nicholas Audley, 3rd Baron Audley. Died without issue. • Richard de Beaumont • John de Beaumont (died young) • Thomas de Beaumont • Alice de Beaumont • Joan de Beaumont, married Sir Fulk FitzWarin, 3rd Lord FitzWarin • Beatrice de Beaumont, married Charles I, Count of Dammartin • John de Beaumont, 2nd Lord Beaumont (1318- 14 April 1342), on 6 November 1330 married as her first husband,
Eleanor of Lancaster, by whom he had issue. He was killed in a
tournament. •
Isabel de Beaumont (c.1320- 1361), married in 1337
Henry of Grosmont, 1st Duke of Lancaster, by whom she had two daughters,
Maud, Countess of Leicester and
Blanche of Lancaster. • Agnes de Beaumont, married Thomas de Lucy, 2nd Baron Lucy ==Countess of Buchan==