It was not uncommon in the Renaissance that alchemists/magicians were acquinted with the royal house and Ripley seemed to have know King Edward IV. In this texts he tries to write about alchemy understandably. This was not only interesting for the King of times past, but also for the student of today.
Epistles to King Edward IV Sir George Ripley set foth by Raph Rabbards. London 1591 (fbn press)