First Time Lord

The First Time Lord was the leader of the Time Lord High Tribunal, alongside the Second Time Lord and Third Time Lord. (PROSE: Doctor Who and the Doomsday Weapon) While having been in one body during his encounter with the Second Doctor, (TV: The War Games, PROSE: Doctor Who and the Doomsday Weapon) he later was in another form during the Doomsday Weapon crisis. (PROSE: Doctor Who and the Doomsday Weapon)

Opening the possibility that this was a transferable title, Morbius, a former Lord President, claimed to be "a Time Lord of the First Rank" in his battle with the Fourth Doctor. (TV: The Brain of Morbius)