Clashed with Sim Ui-gyeom over a key personnel post and became leader of the Easterners
A disciple of Yi Hwang and Jo Sik, he led the younger sarim. In 1575 his followers formed the Easterners, named after his house in Geoncheon-dong in the east of the capital. The Easterners later split into Southerners and Northerners.
A clash between Kim Hyo-won and Sim Ui-gyeom over a key personnel post split the Sarim into Easterners and Westerners, beginning factional politics.
Neo-Confucian scholar of western Gyeongsang who stressed reverence, righteousness and practice; his disciples formed the Northerners and led militias in the Imjin War
From the literati purges to in-law government — how Sarim factions moved from coexistence and checks to purges and one-faction rule, then through Tangpyeong to the dominance of a few clans