Goryeo
Power struggles

The Inju Yi clan married women to the kings from the time of Munjong to the 17th King, Injong. Eventually the Inju Yi clan gained more power than the monarch himself. This led to the coup of Yi Cha-gyŏm in 1126. It failed, but the power of the monarch was weakened; Goryeo underwent a civil war among the nobility.

In 1135, Myocheong argued in favor of moving the capital to Seogyeong (present-day Pyongyang). This proposal divided the nobles. One faction, led by Myocheong, believed in moving the capital to Pyongyang and expanding into Manchuria. The other one, led by Kim Bu-sik (author of the Samguk Sagi), wanted to keep the status quo. Myocheong failed to persuade the king; he rebelled and established the state of Daebang, but it failed and he was killed.
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