A historian was someone who studied and wrote about the past. They usually did not undertake field research, which was the purview of archaeologists and paleontologists and the like.

Dojjen was a Manussan historian and Ambril's predecessor as Director of Historical Research. He believed that the Mara had not been destroyed and would someday return. He learned the rituals needed to defeat the Mara and taught them to the Fifth Doctor. (TV: Snakedance)

Tranlis Difarallio was a historian who studied the history of the Forrester family. He wrote From the Gutter to the Stars: A History of the Forrester Family. (PROSE: Dependence Day)

Evelyn Smythe was a historian and companion of the Sixth Doctor. (AUDIO: The Marian Conspiracy, et al)

Kronos Vad was a famous historian who wrote a complete series on the history of Earth. Volume 36,379 played a key part in defeating the Gomagog. He was an acquaintance of Iris Wildthyme. (AUDIO: Kronos Vad's History of Earth Vol. 36,379)

Vesuvius was a robot historian in an alternate Rome. (COMIC: Doctor Who and the Iron Legion)

Ibrahim Hadmani was an Egyptian historian. (PROSE: The Last Pharaoh)

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