I read on the Catholic encyclopedia:
Historians have a still greater latitude in the performance of their task. This is not of course because the dead have lost their claim to have their good name respected. History must be something more than a mere calendar of dates and incidents; the causes and connection of events are a proper part of its province. This consideration, as well as that of the general utility in elevating and strengthening the public conscience, may justify the historian in telling many things hitherto unknown which are to the disgrace of those of whom they are related.
Would this mean that it is allowed for a student to show the faults in a historical figure in an essay? Thank you