정철
Yi I attempted to prevent the factional split by appointing Shim Eui-gyeom and Kim Hyo-won to provincial posts away from the court and tried to arrange truce between Easterner Yi Bal and Westerner Jeong Cheol. After Yi I's death, however, the conflict between two factions became more intense as the Easterners impeached Shim Eui-gyeom, leading to his dismissal, and gained upper hand.