 Complete the following phrase:  Isabel de Verdun, Baroness Ferrers of Groby 21 March 1317  25 July 1349 was an heiress, who was related to the English royal family as the eldest daughter of Elizabeth de Clare, herself a granddaughter of King Edward I of England. When she was a child, Isabel was imprisoned in Barking Abbey, along with her mother and half-sister, after her stepfather had joined the Earl of Lancasters ill-fated 