Qin (秦) (778 BC-206 BC) was a state during the Spring and Autumn and Warring States Periods of China. It eventually grew to dominate the country and unite it for the first time, after which it is referred to as the Qin Dynasty. The royal surname is Ying (嬴).
222 BC Qin conquers Yan. Qin captures King Jia of Dai (step-brother of King Qian of Zhao) who had led the last Zhao forces.
221 BC Qin conquers Qi, completing the unification of China, and ushering in the Qin Dynasty. Ying Zheng becomes China's first emperor, and is known as Qin Shi Huang Di.