Isabel was born on 5 September 1451, at Warwick Castle, the seat of the Earls of Warwick. She was the elder daughter of Richard Neville, 16th Earl of Warwick (aka Kingmaker), and his wife Anne de Beauchamp. Isabel had a younger sister, Anne, who would become Queen of England as Richard III ’s wife. In 1469, when Isabel was 17, her ambitious father betrothed her to George Plantagenet, 1st Duke of Clarence and heir presumptive to the throne of England; he was the brother of King Edward IV and the future Richard III. King Edward opposed the marriage because it would bring the already powerful Earl of Warwick too close to the throne. However, George and Isabel did get married in secret, in a ceremony in Calais on 11 July 1469. Following the marriage, George joined forces with Warwick and changed sides in the Wars of the Roses: he allied with the Lancastrians (led by Margaret of Anjou ) against his own brother and the Yorkists. When Isabel’s sister Anne married Edward of Westminst...