Roger Bacon completes his work Opus Majus and sends it to
Pope Clement IV, who had requested it be written; the work contains wide-ranging discussion of
mathematics,
optics,
alchemy,
astronomy,
astrology, and other topics, and includes what some believe to be the first description of a
magnifying glass. Bacon also completes Opus Minus, a summary of Opus Majus, later in the same year. The only source for his date of birth is his statement in the Opus Tertium, written in 1267, that "forty years have passed since I first learned the alphabet". The
1214 birth date assumes he was not being literal, and meant 40 years had passed since he matriculated at
Oxford at the age of 13. If he had been literal, his birth date was more likely to have been around
1220.[6][7]
The leadership of
Vienna forces
Jews to wear Pileum cornutum, a cone-shaped head dress, in addition to the
yellow badges Jews are already forced to wear.[8]
Spain attempts an invasion of
Morocco, but the Muslim empire
Marinid Sultanate successfully defend against the invasion, and drive out Spanish forces.[13]
^Streitz, N.; Rizk, A.; Andre, J.; André, J. (1990).
"Links and Structures in Hypertext Databases for Law". Hypertext: Concepts, Systems and Applications: Proceedings of the First European Conference on Hypertext, INRIA, France, November 1990. Cambridge and New York: Cambridge University Press. p. 194.
ISBN9780521405171.
Roger Bacon completes his work Opus Majus and sends it to
Pope Clement IV, who had requested it be written; the work contains wide-ranging discussion of
mathematics,
optics,
alchemy,
astronomy,
astrology, and other topics, and includes what some believe to be the first description of a
magnifying glass. Bacon also completes Opus Minus, a summary of Opus Majus, later in the same year. The only source for his date of birth is his statement in the Opus Tertium, written in 1267, that "forty years have passed since I first learned the alphabet". The
1214 birth date assumes he was not being literal, and meant 40 years had passed since he matriculated at
Oxford at the age of 13. If he had been literal, his birth date was more likely to have been around
1220.[6][7]
The leadership of
Vienna forces
Jews to wear Pileum cornutum, a cone-shaped head dress, in addition to the
yellow badges Jews are already forced to wear.[8]
Spain attempts an invasion of
Morocco, but the Muslim empire
Marinid Sultanate successfully defend against the invasion, and drive out Spanish forces.[13]
^Streitz, N.; Rizk, A.; Andre, J.; André, J. (1990).
"Links and Structures in Hypertext Databases for Law". Hypertext: Concepts, Systems and Applications: Proceedings of the First European Conference on Hypertext, INRIA, France, November 1990. Cambridge and New York: Cambridge University Press. p. 194.
ISBN9780521405171.