King Seongjong and Institutional Consolidation
King Seongjong, the ninth monarch of Joseon, completed and implemented the Gyeongguk Daejeon, solidifying the legal and administrative framework of the state. He expanded the Hongmungwan as an advisory and research institution, promoting Neo-Confucian scholarship, bureaucratic oversight, and state publishing projects. Seongjong strengthened social regulations based on Confucian ethics, including restrictions on remarried women's sons, and launched military expeditions to secure the northern frontier. His reign represented a peak in institutionalizing Joseon's cultural and political governance.
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