Robert de Vere

Type Figure Region England Time 1362–1392 Also known as Robert de Vere、Robert de Vere, 9th Earl of Oxford、Duke of Ireland

Earl of Oxford, later created Duke of Ireland, born 1362, the favourite courtier of Richard II;…

Timeline

1381–1385London · LondonAfter 1381 he rose to dominance as Richard took personal rule; appointed Chief Justice in 1385, he broke the nobility's monopoly on justice, provoking a strong backlash from Gloucester and other royal kin.
1386–1390Oxfordshire · OxfordshireCreated Duke of Ireland in 1386 and led troops to Ireland; returning to England in 1387 he was defeated at Radcot Bridge by the Appellant lords led by Thomas of Woodstock, and was forced to flee to France, still not having returned by 1390.

Robert de Vere, 9th earl of Oxford https://www.britannica.com/biography/Robert-de-Vere-9th-earl-of-Oxford
Richard II and the Revolution of 1399 — Anthony Tuck (1973)
Vere, Robert de, ninth earl of Oxford (DNB) — James Tait (2004) https://www.oxforddnb.com/display/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-28209