Historiography is the study of methodology and history. Historiography may refer to a specific study like techniques, writings and more.
Historiography strongly suggest about history that it keeps on changing depends on who studied it and what kind of study did the historian do. Histories are not always perceived as the same, there will be always different thoughts of how the events happened and how it was resolved. Through the years, history evident also change because no one really knows the real story.