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