Sukjong of Joseon

In the early years of Sukjong's reign, the Southern faction and Western faction clashed over the Royal Funeral Dispute, a seemingly minor issue regarding the mourning period for Queen Insun. The Southern faction claimed that the mourning period should last one year while the Western faction argued for a nine-month mourning period. A one-year mourning period meant that Hyojong of Joseon was considered the eldest son while 9-month period would suggest that Hyojong was considered not the eldest son, following the rules that governed the yangban class. In other words, the Western faction viewed the royal family as the first of the yangban class rather than a separate class for which different rules applied. The two factions were also in conflict over the issue of fighting the Qing Dynasty, which was considered barbaric country (as opposed to Ming Dynasty) that threatened Joseon's national security. The Southern faction, led by Heo Jeok and Yun Hyu, supported war against Qing while Western factions wanted to focus first on improving domestic conditions.

Sukjong at first sided with the Southern faction, but in 1680, Heo Jeok was accused of treason by Western faction, which led to the execution of Heo Jeok and Yun Hyu and purging of the Southern faction. This incident is called Gyeongsin hwanguk (경신환국). Now in power, the Western faction split into the Noron (Old Learning) faction, led by Song Siyeol, and the Soron (New Learning) faction, led by Yun Jeung. After nine years in power, the Noron collapsed when Sukjong deposed Queen Inhyeon, who was supported by the Western faction, and named Consort Hui of 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 in Joseon Dynasty, and her beauty was 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 Siyeol in revenge. This is called Gisa hwanguk (기사환국).

Five years later in 1694, the Southern faction was planning another purge of the Western faction, accusing them of conspiracy to reinstate the deposed Queen Inhyeon, when Sukjong began to regret deposing Queen Inhyeon and favor Consort Suk of Choe clan (Consort Choe), an ally of Queen Inhyeon 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 in power. The Southern faction would never recover from this blow, also called Gapsul hwanguk (갑술환국). Sukjong demoted "Queen Jang" to Consort "Jang Hui-bin" and reinstated "Queen Inhyeon". Consort Jang was eventually executed (with poison) for cursing Queen Inhyeon to her death. The Soron faction supported Crown Prince Hwiso (Yi-Yun), Consort Jang's son, while the Noron faction supported Consort Choe's son, Prince Yeonying (Yi-Geum), later to become Yeongjo of Joseon. Late "Queen Inhyeon" and newly installed "Queen Inwon" were childless.

In 1718, Sukjong allowed the crown prince, soon to be Gyeongjong of Joseon, to rule the country as regent. Sukjong died in 1720 supposedly after telling Yi Yi-myoung to name Yeoning-geum as Gyeongjong's heir, but in absence of a historiographer or recorder. This will would lead to yet another purge which led to the execution of four Noron leaders in 1721, followed by another purge with the executions of eight Noron people in 1722.

Sukjong made tax system reform (大同法), promoted the use of coinage (Korean mun) and allowed the middle class and children of concubines to advance to higher governmental positions in provinces. In 1712, Sukjong's government worked with the Qing Dynasty in China to define the national borders between the two countries at the Yalu and Tumen Rivers. The Japanese government recognized Ulleung Island as Joseon's territory in 1696 (Korean Government insists that Liancourt Rocks was also recognized.[1] But Japanese Government insists that Liancourt Rocks was not recognized as Joseon's territory[2]).

Sukjong's reign also saw agricultural development of far provinces and increased cultural activities including publications. He died after reigning for 46 years in 1720 at age 60. He was buried in Myeongreung (명릉) in Gyeonggi province, Goyang City inside Western Five Royal Graves (西五陵 서오릉 seooreung).