Isabella de Fortibus, Countess of Devon dating history

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Isabella de Fortibus (or de Forz) (July 1237 – 10 November 1293) was the eldest daughter of Baldwin de Redvers, 6th Earl of Devon. At the age of 11 or 12 she became the second wife of William de Fortibus (or Forz) who owned land in Yorkshire and Cumberland and was the count of Aumale in Normandy. When he died in 1260 part of his estates (her "dower lands") were granted to her. Two years later, in 1262 her brother Baldwin de Redvers, 7th Earl of Devon, died and left her his lands in Devon, Hampshire, the Isle of Wight and Harewood in Yorkshire. She was in her mid-twenties and was one of the richest heiresses in England. She subsequently called herself countess of Aumale and of Devon, and lady of the Isle (of Wight).