Qin also Ch'in 
(chĭn)
(chĭn) A Chinese dynasty (221-206 BC) that established the first centralized imperial government in China. Much of the Great Wall of China was built during the rule of this dynasty.
[Mandarin Qín, name of an ancient Chinese state (originally the name of a fief located in what is now Gansu province, from which the state grew), Qin dynasty, from Middle Chinese tsɦin.]