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).
Duke Ling of Qi
In 572 BC, Duke Dao of the State of Jin attacked Qi. Duke Ling made peace with Jin by sending his son Prince Guang (later Duke Zhuang II of Qi) to Jin as a hostage. Nine years later Prince Guang was made the crown prince of Qi.