1270 CE
A year marked by the disastrous Eighth Crusade and the death of King Louis IX of France before the walls of Tunis, ending the era of major Crusading expeditions from Western Europe.
Conflict & Security
- King Louis IX of France launched the Eighth Crusade, diverting his forces to Tunis in North Africa instead of the Holy Land, likely influenced by his brother Charles of Anjou's Mediterranean ambitions.
- Louis IX died of disease outside Tunis on August 25, bringing the Eighth Crusade to an ignominious end and marking the effective close of the major Crusading movement.
- Charles of Anjou, King of Sicily, arrived at Tunis shortly after his brother's death and negotiated a withdrawal treaty with the Hafsid ruler, gaining financial concessions but achieving no lasting military gains.
Geopolitics & Diplomacy
- The Mamluk Sultan Baybars continued his systematic conquest of Crusader strongholds in the Levant, capturing fortresses and coastal cities that had been held by the Franks for generations.
- Prince Edward of England, the future Edward I, continued on to the Holy Land after the collapse of the Eighth Crusade, undertaking a small-scale campaign that achieved little of strategic significance.
Climate & Environment
- Atmospheric carbon dioxide concentration was approximately 275 parts per million, as later confirmed by ice core analysis.
Culture & Society
- The death of Louis IX was mourned across Christendom, with the French king widely regarded as the ideal of a Christian monarch and later canonized as a saint in 1297.
- The estimated world population was approximately 386 million.