The method that a historian would use when they are thinking of how an author's feelings leads them to favor things is the point of view.
The point of view of an author will enable a historian to more accurately describe the events that the author was writing about.
This is because the historian will be able to know if the author had feelings that influenced the way they favored one thing or another thereby showing bias.
For instance, in writing about the Roman conquest of Egypt under Cleopatra, a historian might come across a depiction of the events according to an Egyptian historian.
The historian would then have to look at the point of view of the Egyptian historian to see if their likelihood to make their ancestors look better in the eyes of history, affected the way they wrote about the event.
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