Time Lords

The Time Lords were inhabitants of the planet Gallifrey, who were most famous for the creation and attempted monopolisation of time travel technology. (COMIC: Time Bomb!, TV: The Time Warrior, PROSE: The Crystal Bucephalus et al.) They created and upheld the Laws of Time. (TV: The Three Doctors, Attack of the Cybermen)

Time Lords were sensitive to timelines, being able to see "all that is, all that was, all that ever could be," (TV: The Parting of the Ways) but also "what must not [be]". (TV: The Fires of Pompeii) They had an instinctive urge to stay away from events that would always happen. (TV: The Waters of Mars) They were seen as nearly immortal, (TV: The War Games, Last of the Time Lords) partially due to their ability to regenerate. (TV: Planet of the Spiders)

The ancient Time Lords were known to take part in battles and conflicts, often helping to hunt species known to be dangerous. (PROSE: Pandoric's Box, et al.) One of the last of these was a war against the Great Vampires, which was so long and bloody that they turned against violence in general. (TV: State of Decay) For at least part of their history, the Time Lords adhered to a strict policy of non-interference. (TV: The War Games) Despite their attempts to keep up an appearance of being uninterested in the affairs of others, they still sent discreet missions where other Time Lords would act on their behalf. (TV: Colony in Space, The Two Doctors, Genesis of the Daleks, et al.) On one occasion, the Fourth Doctor was instructed to intercept the creation of the Dalek race, (TV: Genesis of the Daleks) a step which eventually led to a war between the two species. (COMIC: Hunters of the Burning Stone, et al.)

By the time of the Sixth Doctor, the Time Lords had reigned in "absolute power" for ten million years. (TV: The Ultimate Foe, PROSE: The Book of the War) During the final day of the Time War, it was claimed the Time Lords' civilisation had lived for a billion years, and they had been time travelling for ten million years. (TV: The End of Time)