Roger Bacon (1219/20-1292), was an English philosopher and Franciscan friar who studied and later taught at Oxford University and the University of Paris. He had a reputation as an unconventional scholar, pursuing learning in alchemy and magic which earned him the soubriquet 'Doctor Mirabilis'. This led to his rejection from the Franciscans and eventual imprisonment. Bacon investigated optics and the refraction of light through lenses, leading to the development of spectacles. He sought reform of the calendar and was interested in astronomy.


Roger Bacon (1219/20-1292), was an English philosopher and Franciscan friar who studied and later taught at Oxford University and also taught the University of Paris. He had a reputation as an unconventional scholar, pursuing learning in alchemy and magic - interests which earned him the soubriquet 'Doctor Mirabilis'. This led to his rejection from the Franciscans and eventual imprisonment. He died in Oxford not long after his release. Bacon investigated optics and the refraction of light through lenses, leading to the development of spectacles. He sought reform of the calendar and was interested in astronomy. In 1266, at the request of Pope Clement IV, he collected many of his observations in his 'Opus Maius', an encyclopaedia of all science. Although gunpowder was first invented and described in China, Bacon was the first in Europe to record its formula.


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