Sir William D'Arcy Peerage person ID=342412 (b. 1330) Parents John Darcy, 1st Baron Darcy de Knayth Lady Joan de Burgh Children William (II) D'Arcy, of Platten Sir John D'Arcy Siblings Elizabeth Butler, Countess of Ormond Aymer Darcy unknown son Darcy Roger Darcy unknown daughter Darcy John Darcy, 2nd Lord Darcy unknown daughter Darcy Lady Emily Fitzgerald Richard FitzGerald, 3rd Earl of Kildare John FitzGerald Maurice FitzGerald, 4th Earl of Kildare Partners Catherine FitzGerald