Richard III of England Wiki

John Morton (c.1420–15 September 1500) was an English prelate who served as Archbishop of Canterbury from 1486 to 1500. He was elevated to the cardinalate in 1493.

Morton was a mentor of the young Sir Thomas More. More served as a page in Morton's house, acted in revels at Morton's court at Knole House, the archiepiscopal palace, and later mentioned him in his work Utopia. Although most scholars credit More with authoring the History of King Richard III (More), they debate the issue of the original authorship. Morton is believed by many to be the originator of the account that More rewrote. Modern-day enthusiasts of King Richard III thereby accuse Morton of inventing the account whereby Richard murdered Edward V and his brother Richard, Duke of York and committed other crimes attributed to him.

More information on the Wikipedia page [1].

Robert Morton (bishop) was his nephew.