called Gyeongsin hwanguk (경신환국). Once in power, the Western faction split into the Noron (Old Learning) faction, led by Song Si-yeol, and the Soron (New Learning) faction, led by Yun Jeung. After nine years in power, the Noron collapsed when Sukjong deposed Queen Min (posthumously called Queen Inhyeon), who was supported by the Western faction, and named Consort Hui of the Jang clan (also called Consort Jang or Jang Hui-bin) as the new queen. She is widely thought to be one of the most beautiful women of Joseon, her beauty mentioned in the Annals. The Western faction angered Sukjong when it opposed the naming of Consort Jang's son as crown prince. The Southern faction, who supported Consort Jang and her son, regained power and drove out Western faction, executing Song Si-yeol in revenge. This is called Gisa Hwanguk (기사환국). Five years later in 1694, as the Southern faction planned another purge of the Western faction, accusing them of conspiracy to reinstate the deposed Queen, Sukjong began to regret deposing Queen Min and favored Consort Suk of the Choe clan, an ally of the Queen and the Noron faction. Angry with the Southern faction's attempt to purge Westerners, Sukjong abruptly turned around to purge Southerners and brought the Western faction back to power. The Southern faction would never recover from this blow, also called Gapsul Hwanguk (갑술환국). Sukjong demoted Queen Jang to her previous title (Jang Hui-bin) and reinstated Queen Min. Consort Jang was eventually executed by poison for cursing the Queen. The Soron faction supported Crown Prince Yi Yun, Consort Jang's son, while the Noron faction supported Consort Choe's son, Prince Yeoning (Yi Geum), later to become Yeongjo of Joseon. The late Queen Inhyeon and the newly installed Queen Kim (posthumously known as Queen Inwon) were both childless. In 1718, Sukjong allowed the crown prince, soon to be Gyeongjong of Joseon, to rule as regent. Sukjong died in 1720 supposedly after telling Yi Yi-myoung to name Prince Yeoning as Gyeongjong's heir - in absence of a historiographer or recorder. This would lead to yet another purge in which four Noron leaders were executed in 1721, followed by another purge with the executions of eight Noron members in 1722. Sukjong's accomplishments include tax reform (大同法), the creation of a new monetary system and currency (Korean mun), and the liberalization of civil service rules promoting the middle class and children of concubines