Patar is a villainous Vulcan who was introduced in the Star Trek: Discovery episode "If Memory Serves".
She and the holographic re-creation of her by Control were portrayed by Tara Nicodemo.
Patar was a member of the Logic Extremists - a renegade group of Vulcans who wanted to impose their own twisted views on logic on Vulcan. At the same time she was a Starfleet officer who rose to the rank of Admiral by 2257. As an Admiral she was able to infiltrate Section 31 and use it to further the goals of the logic extremists, which was to use control to take over the Federation.
In 2257 Patar was at the former prison space station serving as Section 31's headquarters when she and the other Admirals leading Section 31 were all killed by Control when it shut down life support on the station. This was part of its bid to take over the galaxy and kill all sentient life in the galaxy. Control then used her image to communicate with Captain Christopher Pike and Admiral Cornwell.
An away team led by Commander Michael Burnham beamed to the station, where they discovered Patar's lifeless body. By then Patar's remains were frozen solid, with Burnham estimating that Patar had been dead for a couple weeks.