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Objectivity is a thorny problem when it comes to interpreting ancient sources.
In many, if not most cases, there is only one surviving account of any particular event, emperor, or situation. That person may have been highly opinionated and have had a great personal stake in the events he or she describes. Indeed, the most interesting ancient writers were either highly one-sided or wrote about the social problems and scandals of their day. Anna Comnena, writing in the Eleventh Century, makes it very clear that she is praising the good deeds of her father, the Byzantine emperor Alexius Comnenus and her Alexiad exalts the Comnenus family name and very vehemently blackens the name of their enemies. Tacitus clearly displays his dislike of the imperial system and his greater dislike of civil wars in his Histories and his Annals.