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.
King Daoxiang of Zhao
Born as Zhao Yan to King Xiaocheng of Zhao, he was originally not groomed to succeed to the throne. However, his path to the throne was eased by the circumstances. Firstly, the heir to the Zhao throne was required to spend a large portion of his youth as a hostage in the Qin court - thus making him susceptible to court intrigue. Secondly, the minister Guo Kai was intent on making Zhao Yan the next king. Therefore, when King Xiaocheng died, instead of welcoming the rightful heir back to Handan, Guo Kai proclaimed Zhao Yan as king instead. The famous Zhao general Lian Po objected to this state of affairs and resigned his posts as a result.