Isabel de Verdun, Baroness Ferrers of Groby 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 halfsister, after her stepfather had joined the Earl of Lancasters illfated rebellion against King Edward II. Her husband was Henry de Ferrers, 2nd Lord Ferrers of Groby.
Isabel was born at Amesbury Priory, Wiltshire, onMarch 1317, the only child of the marriage of Theobald de Verdun, 2nd Lord Verdun, Justiciar of Ireland and Lady Elizabeth de Clare. She was born eight months after her father died of typhoid onJuly 1316. He and Elizabeth had been engaged before she was called back to England by Edward II, intent on marrying her to one of his own supporters. So Theobald abducted Elizabeth from Bristol Castle in early 1316, and married her shortly afterwards onFebruary. Elizabeth was his second wife, his first wife having been Maud Mortimer . Isabel had three halfsisters from her fathers prior marriage, Joan de Verdun, Elizabeth de Verdun, and Margery de Verdun.
Source: Wikipedia