Adelphi

A Time Lord was living on Gallifrey when a report on the Doomsday Weapon went missing from the Time Lords' files. He was one of those convinced the Master had taken it. A group of Time Lords, including this individual, sent the Third Doctor to the planet Uxarieus in the year 2472 to investigate.

He expressed doubt over whether or not the Doctor would help, and he pointed out the Doctor had good reason to resent them since they'd taken away his freedom, though he silently accepted that his freedom would be temporarily restored to investigate what the Master was doing. (TV: Colony in Space)