King Zhaoxiang of Qin
Reigning over 55 years, he was one of the longest-serving rulers during the Eastern Zhou Dynasty. Although making numerous policy mistakes during his later years, his aggressive territorial expansions were pivotal in consolidating the state of Qin as the dominant military powerhouse in the late Warring States period. It was the strategic dominance established during his reign that paved the way to Qin's eventual successful unification of China under his great-grandson, Ying Zheng.
Transition from Ming to Qing
The Jianzhou Jurchen chief, Nurhaci, is retrospectively identified as the founder of the Qing dynasty. In 1616 he declared himself "Khan". His unifying efforts gave the Jurchen the strength to assert themselves backed by an army consisting of majority Han defectors as well as Ming produced firearms. In 1618 he proclaimed Seven Grievances against the Ming and the Ming General Li Yongfang surrendered the city of Fushun in what is now Liaoning province in China's northeast, after Nurhaci gave him an Aisin Gioro princess in marriage and a noble title. The Princess was one of Nurhaci's granddaughters. In a series of successful military campaigns in Liaodong and Liaoxi (east and west of the Liao River), the Jurchens seized a number of Ming cities including Shenyang, which they made into the capital of their newly founded "Later Jin" dynasty, named after a Jurchen polity that had ruled over north China several centuries earlier.