Isabel of Cambridge, Countess of Essex Countess of Essex (1409–1484) Parents Anne Mortimer, Countess of Cambridge Richard of Conisburgh, 3rd Earl of Cambridge Children Sir Edward Bourchier Hugh Bourchier William Bourchier, Viscount Bourchier Humphrey Bourchier Isabella Bourchier Henry Bourchier Florence Bourchier Edward Bourchier Fulk Bourchier John Bourchier, 6th Baron Ferrers of Groby Thomas Bourchier Siblings Richard of York, 3rd Duke of York Henry of York Partners Henry Bourchier, 1st Earl of Essex Thomas Grey