Tripitaka Koreana completed
1251Notable
Goryeo finishes carving the Buddhist canon onto over 80,000 woodblocks to seek protection from Mongol invasion. The blocks survive at Haeinsa Temple as the most complete Buddhist canon in Chinese script.
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Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → First stone tools → Genus Homo appears → Homo erectus → Control of fire → First fired clay figures → First pottery → Copper smelting → Bronze Age begins → Shang dynasty → Zhou dynasty and the Mandate of Heaven → Spring and Autumn period → Legalism (Shang Yang) → Qin unifies China → Han dynasty → Sui reunifies China → Imperial examinations → Tang dynasty → Silla unifies Korea → Goryeo dynasty → Tripitaka Koreana completed
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