Vansell

Vansell (full name Vansellostophossius) was coordinator of the Celestial Intervention Agency, he was a determined person who did his utmost to keep Gallifrey in its position of power, and to maintain the Web of Time, in an altered timeline he attempted to kill the Doctor on multiple occasions. (DW: The Sirens of Time)

At the Academy the Doctor knew him, and his name (supposedly) his nickname was 'Nosebung'. (BFA: Neverland)

Vansell lead an expedition into the world of Anti-Time to find what he believed to be Rassilon's body, however he become possessed by the anti-time energy, and attempted a coup.

Vansell was killed when he assisted Lady President Romana in a plan (after overcoming the possession of anti-time) he was trapped within the Time Station's temporal reactors, and was vaporised as a result. (BFA: Neverland)