Robert de Vere, duke of Ireland (died 1392)

Robert de Vere, 9th Earl of Oxford

English 14th century nobleman and a favourite of Richard II, King of England

Robert de Vere, 9th Earl of Oxford, KG was a favourite and court companion of King Richard II of England. He was the ninth Earl of Oxford and the first Duke of Ireland and the only Marquess of Dublin. He was also the first person to be created a Marquess.