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Joan FitzAlan, Countess of Hereford, Countess of Essex and Countess of Northampton (1347 – 7 April 1419) was the wife of the 7th Earl of Hereford, 6th Earl of Essex and 2nd Earl of Northampton. She was the mother of Mary de Bohun, the first wife of Henry of Bolingbroke who later reigned as King Henry IV, and Eleanor de Bohun, Duchess of Gloucester. She was the maternal grandmother of King Henry V. Wikipedia