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