Al-Mustazhir vs Injong of Goryeo

Al-Mustazhir was caliph when the First Crusade began. The crusaders captured Jerusalem in 1099. The caliphate, under Seljuk domination, did not directly confront the crusaders, but the event marked a shift in regional power dynamics.

Al-Mustazhir faced a rebellion by the Seljuk Sultan Muhammad I, who besieged Baghdad. The caliph was forced to accept Muhammad's authority and pay tribute, further reducing caliphal independence.

Al-Mustazhir's vizier, Amid al-Dawla, was assassinated by the Seljuk faction. This event demonstrated the caliph's inability to protect his own officials and the extent of Seljuk control over the caliphal administration.

The Buddhist monk Myocheong led a rebellion in Pyongyang, advocating for moving the capital and attacking the Jurchen Jin dynasty. King Injong initially supported the plan but later opposed it, leading to a three-year revolt that was crushed by the general Kim Bu-sik.

General Kim Bu-sik, acting on Injong's orders, besieged and captured Pyongyang, ending the Myocheong rebellion. The victory strengthened the authority of the civil bureaucracy over military and religious factions, but also deepened regional tensions.

Injong oversaw the compilation of a new legal code based on Tang and Song Chinese models. The code standardized administrative procedures and criminal law, but its implementation was uneven due to aristocratic resistance.