- Roger Bacon completes his work ''Opus Majus'' and sends it to Pope Clement IV , who had requested it be written; the work contians 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 leadership of Vienna forces Jew s to wear ''Pileum cornutum'',a cone-shaped head dress, in addition to the Yellow Badge s Jews were already forced to wear.
- In England , the Statute Of Marlborough is passed, the oldest English law still (partially) in force.
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