1274 CE
A year marked by the death of Thomas Aquinas, the first Mongol invasion of Japan, and the Second Council of Lyon's attempt to reunify the Christian Churches.
Culture & Society
- Thomas Aquinas, the Dominican friar and the most influential philosopher-theologian of the medieval period, died on March 7 at the Cistercian abbey of Fossanova while traveling to the Council of Lyon.
- Aquinas left behind an immense body of work including the Summa Theologiae, which synthesized Aristotelian philosophy with Christian theology and became the foundation of Catholic intellectual tradition.
- The estimated world population was approximately 387 million.
Conflict & Security
- Kublai Khan launched the first Mongol invasion of Japan in November, sending a fleet of approximately nine hundred ships carrying tens of thousands of soldiers to the Japanese island of Kyushu.
- Japanese samurai forces resisted the Mongol landing at Hakata Bay, and a devastating typhoon destroyed much of the invasion fleet, forcing the Mongols to withdraw with heavy losses.
Geopolitics & Diplomacy
- The Second Council of Lyon convened under Pope Gregory X and achieved a nominal reunion between the Roman Catholic and Greek Orthodox Churches, though the union was rejected by most of the Byzantine clergy and people.
- King Edward I of England returned from the Holy Land and was crowned, beginning a reign that would reshape English governance, law, and territorial ambitions.
Climate & Environment
- Atmospheric carbon dioxide concentration was approximately 275 parts per million, as later confirmed by ice core analysis.