Jungjong of Joseon vs Simeon I

Jungjong was installed as king after the overthrow of his half-brother Yeonsangun. His reign began with promises of reform but was soon dominated by factional struggles.

Jungjong's reign saw the Third Literati Purge, in which Sarim scholars who attempted to implement reforms were purged by the Hungu faction. This set back reform efforts and deepened factional divisions.

After Jungjong's death, his wife Queen Munjeong became regent for their young son Myeongjong. Her regency continued the factional conflicts that had marked Jungjong's reign.

Under Simeon I's patronage, the Preslav Literary School flourished, producing translations of Greek religious texts and original works in Old Church Slavonic. This cultural golden age advanced Slavic literature and liturgy.

Simeon I was crowned 'Emperor of the Bulgarians and the Romans' by the Patriarch of Constantinople, though the Byzantine court later disputed this. This act elevated Bulgaria to imperial status and challenged Byzantine supremacy.

Simeon I's Bulgarian army decisively defeated the Byzantine forces at the Achelous River. This victory allowed Simeon to claim the title 'Tsar of the Bulgarians and the Romans' and established Bulgaria as a major power in the Balkans.

Simeon I besieged Constantinople, the Byzantine capital, but failed to capture it. The siege ended with a peace treaty that recognized Simeon's imperial title but did not grant him control of the city.