History, like archeology and paleontology, often take a set of facts or evidentiary items and weave a plausible narrative around it. The narrative can be neutral but also can be stereotyped (in archelogy unknowns are assigned religious significance) or they can be influenced by contemporaneous thought --that is, the narrative is allowed to be influenced by the currents of the day. It may take a century or so for those narratives to be dispelled through the passage of time when such influence wanes.