(covers information from several alternate timelines)
This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
In an alternate timeline experienced by Emperor Philippa Georgiou via the Guardian of Forever, the emperor tasked Captain Sylvia Tilly with the interrogation of Captain Michael Burnham. She had become involved in a conspiracy to overthrow the emperor. The methods used in the interrogation it was hoped would lead to Burnham revealing the names of her accomplices, so they could be dealt with. (DIS: "Terra Firma, Part 2")