春秋五覇
Duke Mu of Qin had ascended the throne in 659 BCE and forged an alliance with Jin by marrying his daughter to Duke Wen. In 624 BCE, he established hegemony over the western Rong barbarians and became the most powerful lord of the time. However he did not chair any alliance with other states nor was he officially recognized as hegemon by the king. Therefore, not all sources accept him as one of the Five Hegemons.