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rtrapasso -> RE: The THREAD!!! (6/16/2007 4:54:11 AM)
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Year 1267:
The Prince of Wales Llywelyn ap Gruffudd signs a treaty recognizing the overlordship of England's Henry III, who authorizes him to receive homage from the other Welsh princes (see 1262; but see also1276).
Pope Clement IV excommunicates the German king Conradin in November for claiming sovereignty over Sicily, but Conradin's fleet gains a victory over that of Charles d'Anjou (see 1266; 1268).
Beijing (Peking) has its beginnings in the town of Khanbelig (or Khanbaliq) constructed by Kublai Khan (see 1260; 1271).
Cambridge, England, is chartered by Henry III (see education, 1231).
Members of London's goldsmith and tailor guilds fight each other in fierce street battles.
Roger Bacon describes principles of a camera obscura that can project pictures. He bases his optics (and other ideas) on what he has learned from writings by the early 11th century Arab philosopher Abu Ali al-Hasan ibn al-Haytham, who said that no mathematical theory or conjecture was necessary to realize that light starts outside the eye and reflects into it and that looking directly at the sun or some other bright object will burn the eye (see Porta, 1553).
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