Sejong the Great Timeline

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  • 15 May 1397 - 8 Apr 1450
  • 1418 - 1450
    Reign of Sejong the Great.
  • 1419
    The Korean navy attacks for a second time the wako pirate bases on Tsushima Island in Japan.
  • 1419
    The Gihae Expansion, Tsushima comes under Joseon control.
  • 1420
    Sejong the Great creates the Hall of Worthies (Jiphyeonjeon) to act both as advisors to the king and as an academic research engine.
  • 1443
    The Japanese and Korean governments sign the Treaty of Kyehae which permits legitimate trade with the intention of weakening the wako pirates.
  • 1443
    Hangul, the Korean alphabet, is finalized by Sejong the Great.
  • 1446
    The 'Hunmin Jeongeum' is published, introducing Hangul, the Korean alphabet.