Elizabeth Montfort was the granddaughter of Peter de Montfort of Beaudesert Castle by Alice Audley, and the daughter of Peter de Montfort (d. before 4 March 1287) and Maud de la Mare, daughter of Sir Henry de la Mare (d.1257), of Ashtead, Surrey.
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Montacute was the third son of William Montagu, 2nd Baron Montagu (d. 18 October 1319), by Elizabeth Montfort (d. August 1354), daughter of Sir Piers Montfort of Beaudesert, Warwickshire.