Samguk Sagi
Samguk Sagi (삼국사기, 三國史記, History of the Three Kingdoms) is a historical record of the Three Kingdoms of Korea: Goguryeo, Baekje and Silla. The Samguk Sagi is written in Hanja (the written language of the literati in traditional Korea) and its compilation was ordered by Goryeo's King Injong (r. 1122-1146) and undertaken by the government official and historian Kim Busik (金富軾) and a team of junior scholars. It was completed in 1145. It is well known in Korea as the oldest surviving chronicle of Korean history.
Background
In taking on the task of compiling the Samguk Sagi ("compiling" is more accurate than "writing" because much of the history is taken from earlier historical records), Kim Busik was consciously modeling his actions on Chinese Imperial traditions, just as he modeled the history’s format after its Chinese forebears.
Specifically, he was harking back to the work of Sima Qian, an official of the former Han Dynasty (206 BCE-24 CE). Nowadays known as the Records of the Grand Historian, this work was released circa 100 BCE under the more modest title of Shǐjì 史記, i.e. Scribe's Records. By allusion, Kim Busik called his own work 三國史記, i.e. Samguk Sagi, where Sagi (nowadays 사기) was the Korean reading of the Chinese Shǐjì.