Maud of Lancaster, Countess of Ulster Irish noble (1310–1377) Parents Maud Chaworth Henry, 3rd Earl of Lancaster Children Elizabeth de Burgh, 4th Countess of Ulster Maud de Ufford, Countess of Oxford Siblings Eleanor of Lancaster Henry of Grosmont, 1st Duke of Lancaster Joan of Lancaster Blanche of Lancaster Mary of Lancaster Isabel of Lancaster Partners Ralph Ufford William Donn de Burgh