What is the birthdate of this King of England, son of Edward, the Black Prince, whose court companion was Robert de Vere, Duke of Ireland?
Robert de Vere, Duke of Ireland: Robert de Vere, Duke of Ireland, Marquess of Dublin, and 9th Earl of Oxford KG (16 January 1362 – 22 November 1392) was a favourite and court companion of King Richard II of England. Richard II of England: Richard II (6 January 1367 – c. 14 February 1400), also known as Richard of Bordeaux, was King of England from 1377 until he was deposed on 30 September 1399. Richard II of England:  Richard, a son of Edward, the Black Prince, was born in Bordeaux during the reign of his grandfather, Edward III.
6 January 1367