King Yejong of Goryeo vs Yeonsangun of Joseon

King Yejong actively promoted Daoism, establishing the Bokwon-gung Daoist temple in the capital. He personally participated in Daoist rituals and invited Daoist priests from Song China, integrating Daoist practices into state ceremonies alongside Buddhism.

Despite his Daoist interests, King Yejong continued to patronize Buddhism. He sponsored the construction of Buddhist temples and supported the printing of sutras. This dual patronage reflected the syncretic religious environment of Goryeo.

King Yejong established a dedicated office for compiling national history. This office was tasked with collecting records and writing the official history of Goryeo, continuing the tradition of historical scholarship and preserving state records.

King Yejong sent a diplomatic mission to the Song court, seeking to strengthen cultural and political ties. The mission brought back books, musical instruments, and knowledge of Song court rituals, influencing Goryeo's court culture.

Yeonsangun ordered the execution of several Sarim scholars who criticized his rule and his mother's status. This purge marked the beginning of his tyrannical reign and intensified factional conflict.

Yeonsangun launched a second, more brutal purge, executing hundreds of officials and scholars. He targeted those involved in his mother's death and any perceived opposition, creating a climate of terror.

Yeonsangun abolished the Office of Censorship (Saganwon) and the Office of the Inspector General (Saheonbu), removing checks on royal power. This allowed him to rule without restraint.

Yeonsangun was overthrown in a coup led by court officials and military commanders. He was deposed and exiled to Ganghwa Island, ending his tyrannical reign. His half-brother Jungjong was installed as king.