The One (Time Lord)

The One was the main alias used by the first incarnation of a Renegade Time Lord who suffered from regenerative dissonance.

Life
The One, as he later became known, (AUDIO: The Eleven) came from a non-ranking family and had little to do with his parents as it was discouraged in Time Lord society, particularly if one had ambition to rise above their social status. Because of his beginnings, the Time Lords had little interest in him. (AUDIO: The Murder of Oliver Akkron)

The One studied the Doctor's story and was inspired by it. He graduated from the Time Lord Academy with a quintuple first across a range of subjects (AUDIO: The Eleven) and later worked at the Panopticon Archive, where he found information about a prototype stellar manipulator. (AUDIO: The Satanic Mill)

When several members of the High Council were away on other business and a certain number of votes were required for particular motions to be passed, the One was given a temporary seat. (AUDIO: The Eleven) He was shamed by a Prydonian and realised that his people were "belligerent children". (AUDIO: The Murder of Oliver Akkron) He later left Gallifrey and became a criminal, at some point regenerating into the Two and living on inside his head due to regenerative dissonance. (AUDIO: The Eleven)

Post-mortem
He gave the Doctor a potential source for his degeneration crisis in the Carpallium System after he offered a way out to the Two. (AUDIO: Two's Company)

Behind the scenes

 * The script of Dark Universe describes the One as a "fussy old archivist, pedantic and knowledgeable on many Gallifreyan secrets".