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.
Qin Er Shi
In 207 BC, the Qin dynasty collapsed fifteen years after its establishment. A son of Fusu (allegedly; there is no firm consensus on what his relationship to the Qin royal family really is), Ziying (子婴), was made "king of Qin state", a reduced title. Ziying soon killed Zhao Gao and surrendered to Liu Bang one year later.