"As a matter of fact, we see Shudras occupying the position of kings and emperors in Vedic times.. Abmedkar] further confirms that some of the most eminent and powerful kings of ancient India were Shudras. The Mahabharata mentions a Shudra king conducting yajnas . And Ambedkar identifies this king with Sudas who is mentioned in the Rig Veda."
January 1, 1970
https://en.wikiquote.org/wiki/Shudra