This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Roger Bacon page from book. en The first page of the letter in secretary hand from Roger Bacon to Pope Clement IV introducing his Opus Tertium September google co jp id wMUKAAAAYAAJ pg PRIA onepage false Plate III from the Rolls Series edition of Bacon's Opus Tertium Opus Minus Compendium Philosophiae and De Nullitate Magiae Roger