Amice, Countess of Gloucester, d. 1 Jan 1224/5, daughter & heir of William fitz Robert, Earl of Gloucester, and Hawise de Beaumont. [Magna Charta Sureties]
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But then she [Isabel, younger sister, but Countess of Gloucester] died only a few days later and her sister Amice, by now the only one of William FitzRobert's daughters still living, seems to have been recognised as Countess of Gloucester till her own death some seven and a half years later. On the other hand Amice's son Gilbert de Clare, Earl of Hertford or of Clare (usually called the latter), was apparently acknowledged as Earl of Gloucester in addition to his other dignity from as soon as the month after his aunt Isabel's death back in 1217. [Burke's Peerage]