Margery, daughter of Humphrey de Bohun by Margaret, eldest daughter and ultimate coheir of 1st Earl of Hereford of the 1141 creation. [Burke's Peerage]
Note Margery was mother of Henry de Beaumont, 5th Earl of Warwick, died 10 Oct 1229, father of Thomas de Beaumont, 6th Earl of Warwick, dsp 26/27 June 1242. Thomas's sister Margery, Countess of Warwick's 2nd husband John du Plessis became known as 7th Earl of Warwick. Margery dsp 3 June 1253. Thus the Earldom went to the cousin, descendant of Alice.