Wiman Joseon
Wi Man (in Korean) or Wei Man (in Chinese) was originally a military leader of the Kingdom of Yan. When king Lu Wan of Yan was defeated by the Han in 195 BCE, Wi Man fled to Gojoseon in north-western Korea and later usurped power from its king in 194 BCE, establishing Wiman Joseon. Recorded in the "Shiji" and the "Book of Han", Wiman was the first ruler in the history of Korea to have been recorded in documents from the same time period.