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
King Zhaoxiang reigned as the King of Qin for 57 years, and was responsible for the state of Qin achieving strategic dominance over the other six major states. During his reign, Qin captured the Chu capital Ying in 278 BC, conquered the Xirong state of Yiqu in 272 BC, slaughtered a 450,000-strong Zhao army at Changping in 260 BC, and overthrew the Eastern Zhou dynasty in 256 BC. These aggressive territorial expansions and the strategic weakening of other rival states paved the path for Qin's eventual unification of China three decades later by his great-grandson Ying Zheng.