Human tribute, including servants, eunuchs, and virgin girls came from: China's various ethnic tribes, Mongolia, Korea, Vietnam, Cambodia, Central Asia, Siam, Champa, and Okinawa [REF].
Zhu Shuang 朱樉 (Prince Min of Qin 秦愍王) had some boys castrated and women seized after a war against minority Tibetic peoples and as a result was reprimanded [REF].