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 289 BC, King Zhaoxiang sent Bai Qi and Sima Cuo to attack Wei, capturing 61 villages around Zhi. However, in 288 BC, Qin was forced to back down when the five eastern states allied together and threatened to attack Qin again. It did not take long for Qin to strike back, capturing Xinyuan (新垣) and Quyang (曲陽) from Wei in 287 BC, and the former Wei capital Anyi (安邑) in 286 BC. In 283 BC, Qin allied with Zhao and attacked Wei again, capturing Ancheng (安城) with its vanguard reaching near the Wei capital Daliang (大梁).