In order for a fictionalized story to be based on real events, the author should include (b.) historical material.
Historical materials relate the past actions which are majorly based on true facts and events. The events are related to something or someone. Historical materials help in linking the fictionalized story to be real and relate to the theme of the story more accurately and clearly. The setting, plot, and character play a major role in the story hence, relating them with the historical materials it reflects the story to be authentic and eventful.