Qin dynasty
Note: King Zhaoxiang of Qin (秦昭襄王) had already been ruling Qin for 51 years when Qin annihilated the Zhou dynasty; however the other six warring states were still independent regimes. Some Chinese historiographers thus used the next year (the 52nd year of King Zhaoxiang of Qin) as the official succession from the Zhou dynasty.
Duke Xiang of Qin
Duke Xiang ruled during a time of turmoil. The Zhou Dynasty had been at war with the western Rong tribes since the time of Duke Xiang's grandfather Qin Zhong. Qin, being the westernmost of the Zhou states, bore the brunt of the fighting against the Rong. Soon after Duke Xiang ascended the throne, in 777 BC he married his younger sister Mu Ying to a Rong leader called King Feng (豐王) in an apparent attempt to make peace. The following year he moved the Qin capital eastward from Quanqiu (犬丘, also called Xichui, in present-day Li County, Gansu) to Qian (汧, in present-day Long County, Shaanxi). Soon afterwards Quanqiu fell to the Rong. Shifu, Duke Xiang's older brother who led the defence of Quanqiu, was captured by the Rong, but was released a year later.