1267 CE

Kings Afonso III of Portugal and Alfonso X of Castile sign the Badajoz Convention, determining the border between the Kingdom of Portugal and the Kingdom of León and ensuring Portuguese sovereignty over Algarve. In a parliament held in Sainte-Chapelle, King Louis IX and his three sons declared their intention to take part in the Eighth Crusade. 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.

In the 1260s, the 13th century.

Geopolitics & Diplomacy

  • February 16 – Kings Afonso III of Portugal and Alfonso X of Castile sign the Badajoz Convention, determining the border between the Kingdom of Portugal and the Kingdom of León and ensuring Portuguese sovereignty over Algarve.source
  • 24 March - In a parliament held in Sainte-Chapelle, King Louis IX and his three sons declared their intention to take part in the Eighth Crusade.Francesource
  • 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.source
  • 12 June - Philip I became the new Count of Savoy.Francesource
  • September 29 – Treaty of Montgomery: King Henry III of England acknowledges Llywelyn ap Gruffudd's title of Prince of Wales.source
  • November 18 – In England, the Statute of Marlborough is passed, the oldest English law still (partially) in force.source
  • Malik ul Salih establishes Samudra Pasai, the first Muslim state in Indonesia.source

Conflict & Security

  • Spain attempts an invasion of Morocco, but the Muslim empire Marinid Sultanate successfully defend against the invasion, and drive out Spanish forces.source
  • by Summer – The Second Barons' War in England ends as the rebels and King Henry III of England accept the peace terms laid out in the Dictum of Kenilworth (1266).source

Technology & Infrastructure

  • The "Grand Capital" is constructed in Khanbaliq (modern-day Beijing) by Kublai Khan, having moved the capital of the Mongol Empire there three years prior.source
  • Construction of Château de Vixouze was initiated.Francesource

Science & Discovery

  • The city of Ostrava in Moravia is first recorded.source
  • 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.source

Culture & Society

  • The leadership of Vienna forces Jews to wear the Pileum cornutum, a cone-shaped head dress, in addition to the yellow badges Jews are already forced to wear.source
  • Roger-Bernard III, Count of Foix married Margaret of Béarn.Francesource

Births

  • February 3 (or February 3, 1266) – Richard FitzAlan, 8th Earl of Arundel (died 1302)source
  • August 10 – King James II of Aragon (died 1327)source
  • Giotto, Italian artist who marked the shift from medieval art to Proto-Renaissance art. (died 1337)source
  • Roger de Flor, Sicilian military adventurer, leader of the mercenary group Catalan Companysource
  • Rainier I, Lord of Cagnes (died 1314)Francesource

Deaths

  • February 21 – Baldwin of Ibelin, Seneschal of Cyprussource
  • March 3 or 4 – Lars, Archbishop of Uppsalasource
  • March 17 – Peter of Montereau, French architect (born c. 1200)source
  • 17 March - Pierre de Montreuil, French architect (birth date unknown)Francesource
  • September 23 – Beatrice of Provence, countess regnant of Provence (born 1234)source
  • 23 September - Beatrice of Provence, Countess Regnant of Provence (born 1229)Francesource
  • 30 September - John, Count of Chalon, French noble (born 1190)Francesource
  • November 19 – Pedro Gallego, Franciscan scholar and translatorsource
  • November 26 – Sylvester Gozzolini, Italian founder of the Sylvestrines (born 1177)source
  • November/December – Hugh II of Cyprus, king of Cyprus and regent of the Kingdom of Jerusalem. (born 1253)source
  • date unknown – John FitzAlan, 6th Earl of Arundel, Breton-English nobleman and Marcher Lord (born 1223)source
  • Beatrice of Savoy, former Countess Consort of Provence (born 1198)Francesource