Feizi (非子) was a Zhou Dynasty Chinese royal horse trainer and breeder. King Xiao of Zhou gave him the surname of Ying (嬴) and rewarded him the Qin City (秦邑, in today Tianshui, Gansu), which later became State of Qin, whose rulers revered him as an ancestor, known as Qin Ying.

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Not to be confused with Hanfeizi , which is a book written by Hanfei (韓非).