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 Min of Qi
In 288 BC. King Min took the title of Di of the East (東帝), and his ally King Zhaoxiang of Qin called himself Di of the West (Di was originally the name of the high god of the Shang. It also (or later) had a weaker sense of sacred or divine; the same character was used to mean Emperor in later times.) But so many people objected that both kings were forced to return to the title of "king" (wáng 王) and there was no Di in China until Qin Shi Huang unified China in 221 BC and gave himself the title of Huang Di, which we translate as Emperor.