Established History
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As acknowledged by the Infinity Doctor, the Time Lords were sworn to protect Established History. The Rutan Host denounced this concept as being no different than the "arrogant, misguided" Sontaran assertion of Established Space. The Time Lords understood that Earth's history underpinned much of established time. (PROSE: The Infinity Doctors)
The Sixth Doctor noted that, had the Neomorph Cybermen succeeded in diverting Halley's Comet to destroy Earth in 1985, it would bring about "a massive change in established history". Knowing that the Time Lords would never allow it, he came to realise that he had become their unwitting agent in thwarting the plot on Telos. (TV: Attack of the Cybermen) The Infinity Doctor also cited the Cybermen as having threatened established history, that the consequences to universal history would be catastrophic were they to destroy the Earth before the human race had reached their full potential. (PROSE: The Infinity Doctors)
During the Last Great Time War, the Twelve observed that the Overseer's retroactive introduction of Ogrons into the Time Paradox Incident and Operation Divide and Conquer was 'now the established history as the Eighth Doctor remembered the Ogrons being present for those events whilst remaining aware that they were not present in the initial chain of events prior to the Overseer's interference. (AUDIO: Planet of the Ogrons [+]Loading...["Planet of the Ogrons (audio story)"])
The Tenth Doctor told Martha Jones that "crossing into established events is strictly forbidden, except for cheap tricks". (TV: Smith and Jones)
Billions of years after the fact, the Eleventh General told Clara Oswald, who had been extracted from the very end of her time stream, that her death was "an established historical event" and could not be altered. He also warned the Twelfth Doctor that, having been dead for "half the lifetime of the universe", an attempt to change Clara's death could fracture time itself. (TV: Hell Bent)
As recorded in TARDIS Type 40 Instruction Manual, Pete Tyler reset the timelines during the Reaper Incident by ending his own life, restoring established history. (PROSE: TARDIS Type 40 Instruction Manual [+]Loading...{"chaptname":"The TARDIS Key","page":"34","chaptnum":"III","1":"TARDIS Type 40 Instruction Manual (reference book)"}) Indeed, upon discovering a wedding video that continued to exist afterwards, Mickey wrote about it on Who is Doctor Who?, theorising the Ninth Doctor may have been "meddling with how history should be". (PROSE: Essay Competition [+]Loading...["Essay Competition (short story)"])
As documented in the Dalek Combat Training Manual, the Daleks knew that Adelaide Brooke was a "pivotal figure" in established history, hence why they didn't exterminate her as to not create a chain-effect that could destabilise their own "doomsday plans." Indeed, the Time Controller Dalek helped coordinate time-travel strategies that apparently wouldn't disrupt established history. (PROSE: Dalek Combat Training Manual [+]Loading...{"chaptname":"Invasion Earth\" & \"Appendix — Dalek Anomalies","chaptnum":"XI","1":"Dalek Combat Training Manual (reference book)"})
