1267

By topic

War and politics

• February 16 - King Afonso III of Portugal and King Alfonso X of Castile sign the Badajoz Convention, determining the border between the Kingdom of Portugal and the Kingdom of Leon, and ensuring Portuguese sovereignty over Algarve.
• May 27 - Treaty of Viterbo: Emperor Baldwin II of Constantinople gifts the Principality of Achaea to King Charles I of Sicily, in the hope that Charles can help him restore the Latin Empire.
• The Second Barons' War in England ends, as the rebels and King Henry III of England agree to peace terms, as laid out in the Dictum of Kenilworth.
• Treaty of Montgomery: King Henry III of England acknowledges Llywelyn ap Gruffudd's title of Prince of Wales.
• The city of Ostrava is founded.

  Culture

• 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.
• 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.
• In England, the Statute of Marlborough is passed, the oldest English law still in force.

  By place

Asia and Africa

• The "Grand Capital" is constructed in Khanbaliq by Kublai Khan, having moved the capital of the Mongol Empire there three years prior.
• Malik ul Salih establishes Samudra Pasai, the first Muslim state in Indonesia.
• Spain attempts an invasion of Morocco, but the Marinids successfully defend against the invasion, and drive out Spanish forces.