Rassilon Era

The Rassilon Era referred to that part of the timeline during which the Time Lords ruled the planet Gallifrey and observed but seldom interfered with the flow of universal history. It presumably began with the ascendancy of Rassilon, founder of Time Lord society. It ended with the destruction of Gallifrey at the conclusion of the Last Great Time War.

The exact relation between this period and the humanian Era, specifically whether they ran in succession or overlap, is uncertain, although the TARDIS's navigational system differentiated between the two. (TV: Doctor Who)

By the Gregorian calendar, the Doctor's adventures on Gallifrey (up to the Time War) took place around 2000000000. (TV: The Trial of a Time Lord: The Ultimate Foe) However, the Rassilon Era had run since the Dark Times. (TV: The Infinite Quest)

Timeline

 * 309906 - The Second Doctor was exiled to Earth. (TV: The War Games, The Deadly Assassin)
 * 5725.3 - Time Lords established the Cult of Morbius. (TV: The Brain of Morbius)
 * 5892.9 - The Master stole information about the Doomsday Weapon from the Matrix. (TV: Colony in Space)
 * 6241.1 - Chancellor Goth visited Tersurus, where he found the decrepit form of the Master. (TV: The Deadly Assassin)
 * 6776.7 - President Romana was captured and imprisoned by the Daleks on Etra Prime. (AUDIO: The Apocalypse Element)
 * 6796.8 - Romana and the Sixth Doctor repeled an invasion of Gallifrey by the Daleks. (AUDIO: The Apocalypse Element)
 * 6798.2 - A Dalek fleet was caught in a temporal paradox within the Vortex. (AUDIO: The Time of the Daleks)
 * 6798.3 - Romana led a mission into the universe of Anti-Time (incorrectly recorded as 6978.3). (AUDIO: Neverland)
 * 6798.5 - The Eighth Doctor foiled the incursion of the forces of Anti-Time, but corrupted himself into Zagreus as a result. (AUDIO: Neverland)