sentence: In 1409 , the Ming dynasty under Yongle Emperor established the Nurgan Regional Military Commission on the banks of the Amur River , and Yishiha , a eunuch of Haixi Jurchen derivation , was ordered to lead an expedition to the mouth of the Amur to pacify the Wild Jurchens .
question: what was someone derived _ from _ ?
answers: Haixi Jurchen