The Jewang Un'gi (Songs of Emperors and Kings) is a historical poem composed by Yi Seung-hyu (李承休) in 1287, in the late Goryeo period. Comprising two volumes, it depicts the history of Korea from Dangun to King Chungnyeol, and is the second-oldest text recounting the legend of Dangun. The title is sometimes alternatively translated Rhymed Chronicles of Emperors and Kings. Yi composed the text after retiring from government service to the Cheoneunsa monastery on Duta-san mountain in Samcheok, in present-day Gangwon province. The Jewangungi is considered important as it is the first history book to record the history of Balhae as Korean history, and has been cited by both North and South Korean scholars. According to Myungkyung University Professor Lee Sooyoung, Yi was motivated to write the Jewangungi due to both the internal political turmoil of the Goryeo court as well as the Yuan dynasty's interference in Goryeo politics during Goryeo under Mongol rule. The first edition of the work was printed in 1295–1296 in Jinju, while Yi was still alive. Both extant texts, however, are from a revised woodcut edition printed in 1360 in Gyeongju. On April 1, 1965, the version kept in Uiwang city was designated South Korean National Treasure No. 418. Another version, held at the Samseong Museum of Publishing in Seoul, was designated National Treasure No. 1091 in 1991. Source: Wikipedia (en)