“It is scarcely surprising that in the atmosphere of superstition and ignorance which reigned in Europe during the middle ages Bacon’s achievements were attributed to his communication with devils, and that his fame spread through Western Europe not as a savant, but as a great magician! His great services to humanity were met with censure, not gratitude, and to the Church his teachings seemed particularly pernicious. She accordingly took her place as one of his foremost adversaries, and even the friars of his own order refused his writings a place in their library. His persecutions culminated in 1279 in imprisonment and a forced repentance of his labours in the cause of art and science.”

Alchemy Rediscovered and Restored: Part I: Historical: Chapter VII: English Alchemists: by A. Cockren, 1940.

Roger Bacon (c. 1214–1294) suffered the suspicion of others. There are other views though: some feel that Middle Age society was more forgiving of scientific endeavour.