Master

Master was the title given to Kojiro Vance, the commanding officer of the Kobayashi Maru. (Star Trek II: The Wrath of Khan)

It was also the title used by Dukat as leader of the Cult of the Pah-wraiths. While he didn't refer to himself directly as master, his Bajoran "children" did.

In the Cult's community aboard Empok Nor, it was required that one get permission from "the master" before conceiving a child. (DS9: "Covenant")