 Other interments included Hubert de Burgh; Edward, the young son of Edward, the Black Prince; Richard FitzAlan, 10th Earl of Arundel and Surrey; John de Vere, 12th Earl of Oxford and his son Aubrey; Edward Stafford, 3rd Duke of Buckingham; and many of the high-ranking knights killed at the Battle of Barnet in April 1471, also Maurice Berkeley, 3rd Baron Berkeley (d.1506) and his wife.Perkin Warbeck, pretender to the English throne, was buried in Austin Friars in 1499 after his execution at Tyburn.The friary was constructed over time, as the availability of money and land permitted.