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 Zhaoxiang of Qin
In 288 BC, King Zhaoxiang contacted King Min of Qi and proposed an alliance where both would claim the title ""Di"", and planned to attack the newly strengthened state of Zhao together. However, King Min was persuaded by Su Qin to renounce his "Di" title, and instead allied with other states to attack Qin, forcing King Zhaoxiang to also renounce his "Di" title. At the same time, Qi took the opportunity to conquer its rival state of Song, which made itself a major immediate threat in the eyes of other states.