Gojong of Goryeo

Mongol forces under General Sartaq invaded Goryeo, capturing Kaesong and forcing King Gojong to flee to Ganghwa Island. The invasion devastated the countryside and led to a tributary agreement that was soon broken.

King Gojong moved the royal court and government to Ganghwa Island to resist Mongol demands for submission. The island's natural defenses allowed Goryeo to continue resistance for nearly 30 years.

Under Gojong's patronage, the Buddhist canon was carved onto over 80,000 woodblocks to invoke divine protection against the Mongols. The Tripitaka Koreana remains one of the most complete and accurate versions of the Buddhist scriptures.

After decades of war, King Gojong agreed to submit to the Mongol Empire, sending his son (future King Wonjong) as a hostage. The peace treaty ended the invasions but made Goryeo a vassal state of the Mongols.