Gallifrey Original
"Original Gallifrey" because the phrase "Gallifrey Original" is only used in Doctor Who and the Time War, whereas multiple other sources use either "original Gallifrey" (Alien Bodies, ect) or "original Homeworld" (The Book of the War, ect)
Talk about it here.
Due to the construction of many duplicates of Gallifrey during the War, the nature and specific fate of the original Gallifrey, or (PROSE: Alien Bodies etc.) original Homeworld, (PROSE: The Book of the War) termed Gallifrey Original by one account, (PROSE: Doctor Who and the Time War) was a matter of contention and speculation.
History
Possible candidates during the War
The War King's Homeworld was believed by The Book of the War to be the original, despite the fact it was not located at the original coordinates, (PROSE: The Book of the War) where Romana III's Gallifrey was. (PROSE: The Ancestor Cell) This was explained as a means of deception, with it being speculated that the War Queen herself may not be aware her world was a clone. (PROSE: Crimes Against History second edition) However, The Book of the War was known to not be wholly accurate. (PROSE: The Book of the War) Indeed, some accounts treated Romana III's Gallifrey as the original. (PROSE: The Ancestor Cell, Crimes Against History second edition)
Fate
Destroyed at the War's end
According to one account, at the end of the Last Great Time War, the Eighth Doctor used the Moment to destroy Gallifrey Original. (PROSE: Doctor Who and the Time War) Similarly, the Eighth Doctor's destruction of Romana III's Gallifrey was seen, by the account which chronicled it, as the destruction of the original Gallifrey. (PROSE: The Ancestor Cell (novel)) Various other accounts failing to mention the existence of multiple Gallifreys also indicated it was destroyed. (TV: The End of the World, PROSE: The Eyeless, COMIC: The Forgotten, Sky Jacks)
Destroyed before the War's end
According to one account, after the destruction of the original Gallifrey, Homunculette trained at Gallifrey XII before attending Qixotl's auction. (PROSE: Alien Bodies)
Survival beyond the War's end
Later accounts indicated that Gallifrey survived the War, although they all called it the Last Great Time War rather than War in Heaven, and lacked any indication of other Gallifreys which could possibly call into question the authenticity of the surviving one. (TV: The Day of the Doctor, Hell Bent)
Behind the scenes
The first edition of Crimes Against History treated the War Queen's Homeworld as the original, while the second edition had her dropping out of the narrative to be replaced by the War King, with a suggestion that she had gone on to become the President of one of the Nine Gallifreys as part of a ruse to construe one of the Cloneworlds as the original. Although this rumour can be taken at face value, a possible interpretation is that these rumours were spread by the War King himself to spread the belief that the Homeworld under his control was secretly the original despite the blatant fact of the original President — Romana — still ostensibly ruling the original Gallifrey at the original coordinates.
