First Rank

Time Lords of the First Rank were presumably individuals of great power in Gallifreyan society, perhaps forming the High Council.

Morbius, who had once been Lord President, claimed to be a "Time Lord of the First Rank" (TV: The Brain of Morbius) as did the Master. (PROSE: First Frontier)

Retro-regeneration, the re-visiting of previous incarnations, was said to have only been attempted by Time Lords of the First Rank. (PROSE: State of Change)