History

History was the perception of time relative to past events, or in the case of time travel, events that hadn't happened yet but were meant to, composing "future history." (TV: Snakedance) As defined by the The Book of the War:

"History has (or is) a structure, but has no tangible existence: it's a method of perceiving time, of recording it, remembering it and attempting to predict it."

- The Book of the War

The Web of Time, described as the "hitching-post of chronology," was created by Rassilon as a meta-structure imposed on history. (AUDIO: Neverland) This process was known as the anchoring of the thread and essentially "built" what could be called "history". (PROSE: The Book of the War)

An individual who wrote about history was known as a historian. (TV: Snakedance) The Silence, if not all of the Church during the Siege of Trenzalore, referred to themselves as "the Sentinels of History" since they were dedicated to preventing the Eleventh Doctor from destroying the universe by releasing the Time Lords, (TV: The Wedding of River Song, The Time of the Doctor) who until the Time War had set themselves up as the "Guardians of History." (COMIC: The Flood)

History could be changed via anomalies like the Time Field, (TV: Flesh and Stone) and events could diverge from causal nexuses onto alternate timelines. As time changed both histories could be remembered by the people who experienced them, resulting in the memory of parallel time streams. (TV: The Wedding of River Song, AUDIO: Prisoners of Fate) Individuals who survived the negation of their timeline could also remember their version of history, and would not know the real history. (AUDIO: Colditz) Parallel universes had different histories from each other. (PROSE: The Face of the Enemy)

If something was erased from history, its possibility was still imprinted on the structure of the universe. (PROSE: Falls the Shadow)

Despite being involved in many events and always showing up when trouble happened, the Seventh Doctor claimed that history happened even when he wasn't around, which Kadiatu Lethbridge-Stewart said was accidental. (PROSE: Transit) After learning from the Fourth Doctor that he was only remembered as a war criminal, Magnus Greel quipped that "it [was] the winning side that [wrote] history". (TV: The Talons of Weng-Chiang) Later, while running through the streets of Paris to stop Scaroth from erasing mankind, the Fourth Doctor called out "Is no one interested in history!?" (TV: City of Death)

History as a subject
History was also a subject taught in schools.

John Smith was a history teacher at Farringham School for Boys. (TV: Human Nature/The Family of Blood)

John Smith was a history teacher at Hulton College. (PROSE: Human Nature)

Barbara Wright (TV: An Unearthly Child) and Miss Shah (TV: Co-Owner of a Lonely Heart) were history teachers at Coal Hill School.

Evelyn Smythe was a history teacher at Sheffield Hallam University. (AUDIO: The Marian Conspiracy)

Mr Parsons was a history teacher at Deffry Vale High School. (TV: School Reunion)

Mrs Pittman (TV: Eye of the Gorgon) and Mr Bradbury (AUDIO: The Thirteenth Stone) were history teachers at Park Vale Comprehensive School.