John Darcy, 1st Baron Darcy de Knayth English peer (1290–1347) Parents Isabel d'Aton Sir Roger Darcy Children Elizabeth Butler, Countess of Ormond unknown son Darcy unknown daughter Darcy Roger Darcy Aymer Darcy John Darcy, 2nd Lord Darcy Sir William D'Arcy unknown daughter Darcy Partners Lady Joan de Burgh Emmeline Heron