"A historian is a person who studies and writes about the past and is regarded as an authority on it. Historians are concerned with the continuous, ...
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methodical narrative and research of past events as relating to the human race; as well as the study of all history in time. If the individual is concerned with events preceding written history, the individual is a historian of prehistory. Some historians are recognized by publications or training and experience. "Historian" became a professional occupation in the late nineteenth century as research universities were emerging in Germany and elsewhere." - (en.wikipedia.org 22.01.2022)