 Arthur was served by sons of English , Irish and Welsh nobility , such as Gearoid Óg FitzGerald , 9th Earl of Kildare , who had been brought to the English court as a consequence of the involvement of his father , Gerald Fitzgerald , 8th Earl of Kildare , in the crowning of pretender Lambert Simnel in Ireland during Henry VII 's reign . Other servants were Anthony Willoughby , a son of Robert Willoughby , 1st Baron Willoughby de Broke , Robert Radcliffe , the heir of the 9th Baron FitzWalter and Maurice St John , a favourite nephew of Arthur 's grandmother Lady Margaret Beaufort . He was brought up with Gruffydd ap Rhys ap Thomas , the son of powerful Welsh nobleman Thomas ap Rhys , Gruffydd grew quite close to Arthur and was buried in Worcester Cathedral upon his death in 1521 , alongside the Prince 's tomb . 
