3Robert de Vere, 6th Earl of Oxford
Robert de Vere, 6th Earl of Oxford (c. 24 June 1257 – 17 April 1331) was the son and heir of
Robert de Vere, 5th Earl of Oxford, by his wife Alice de Sanford. Robert the younger took part in several of the military campaigns of
Edward I,
Edward II and
Edward III in
Wales,
Scotland and
France. He was married to Margaret Mortimer, daughter of
Roger Mortimer, 1st Baron Wigmore. He also officiated at the Coronation of Queen
Isabella, wife of Edward II, in 1308. His only son Thomas died before him, and when Robert died in 1331, he was succeeded by his nephew
John de Vere, 7th Earl of Oxford.