Joseon policy Amyclas Geumgwan Balhae Magonid Argishti sakoku Koguryo Namri Magadha Naemul Gija Yusa Goryeo Wakea Sinjong Gaya BC Sagi Sakoku Ithome unilateralist Songun Tonggam juche Hwandan Miletus Purushotthama Peisistratos ChosQundn simha Valagamba Slembe ChaoxiQundn Bosporan Chaoxian 2333