King Zhaoxiang of Qin
Because King Zhaoxiang had not yet legally come of age (traditionally at the age of 20), his mother, who was now known as Queen Dowager Xuan, became the regent. She was supported by her brothers, Wei Ran and Mi Rong (羋戎), as well as two other sons, Prince Yi (公子悝) and Prince Fu (公子巿), the four of them collectively known as the "Four Nobles" (四貴).
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.