In 1590, the Easterners Yi Sanhae and Yu Seongryong and the Westerner Jeong Cheol were the three State Counciliors - Samjeongseung (삼정승).
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Yi I was angered that Jeong had changed the words of his advice, forcing Jeong to revoke his former words by saying that though Jeong Cheol had done much wrong, he did not create a faction.
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When Seonjo asked Jeong who "the other officials" were, Jeong replied that it was Jeong Cheol and the Yun Dugu brothers, who were at the time the sole Westerners in court.
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Jeong Yeorip's Purge in 1588 could be said to have divided the Easterners, but the date 1591 is selected in this article because 1591 was the date that decisively split the Easterners in half, due to the controversy regarding the fate of the Westerner Jeong Cheol.
Jeong Cheol | Yoon Jeong-hee | Jeong Yak-jong | Jeong Seon | Choi Jeong-yoon | Yoon Yeo-jeong | Won Jeong-hwa | View of ''Apgujeong-dong'' drawn by Jeong Seon | Mun Jeong Hyeon | Kim Yeong-cheol | Kim Byong-Cheol | Kang Hyeong-cheol | Jeong Yeorip's Purge | Jeong Jae-heon | Han Eun-jeong |