Soreth was a Vulcan male who lived in the 22nd and 23rd centuries. As a young man, Soreth was a member of the Vulcan military, having served during Vulcan's conflicts with the Andorian people.

By the 2270's, Soreth was serving as a Federation Commissioner. Soreth was sent to the Lorina colony on Daran IV to serve as a Federation observer and advisor to Natira and the Fabrini. He endorsed a purely secular society for the Fabrini, and encouraged them to totally reject the religious traditions of their ancestors. When the Fabrini realized that the only way to stop the strife in their society was to balance their secular and religious traditions, Natira and Rishala requested a different representative. Soreth agreed to step down, and subsequently returned to Federation space on board the USS Enterprise (NCC-1701). (TOS novel: Ex Machina).