 The oldest ones that had been proven are the potteries of the late Neolithic Age, more than 4,500 years ago.Those relics also include some human-used weapons and producing tools which have thousands of years of history.According to the Samguk Sagi, Goguryeo was founded above the mountain in 37 BC, and the mountain city remained its capital until King Yuri moved it to Gungnae Fortress in 3 AD.