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).
Qin (state)
According to the 2nd century  historical text "Records of the Grand Historian" by Sima Qian, the Qin state traced its origin to one of the Five Emperors in ancient times, named Zhuanxu. One of his descendents, Boyi, was granted the family name of "Ying" () by King Shun. During the Xia and Shang dynasties, the Ying split in two: a western branch in Quanqiu (present-day Lixian in Gansu) and another branch that lived east of the Yellow River. The latter became the ancestors of the rulers of the Zhao state.