King Chungnyeol
Twenty-fifth king of Goryeo and the first to marry a Yuan princess; Goryeo was drawn into the invasions of Japan
He married Princess Jeguk, daughter of Khubilai, the Yuan emperor Shizu. From then on royal posthumous names began with Chung (loyal), and the government offices were downgraded, for example to the Cheomuibu and Miljiksa. The Yuan set up the Branch Secretariat for the Eastern Campaigns to invade Japan, and Goryeo supplied troops and ships for the campaigns of 1274 and 1281. Goryeo recovered the Dongnyeong Prefecture, while a falconry office was set up to send hawks to the Yuan. In his reign Iryeon wrote the Samguk yusa and Yi Seung-hyu the Jewang ungi.