we can come to know the lifestyle of people in the past...and also about the rulers who had ruled our world in the past.

# it is well known fact the human mind tends to understand things,better than hearing or listening that particula information.
# hence visual matter[cinema] helps us to uderstand it betterly and particularly about the history or a famous person in the cinemas.
# the cinema is only taken from the real life to get understand about our mother nation.
# one can take example of sreerama rajyam to get understand about the ethics of ramayana.
As it is said often cinema is the reflection of the society! So naturally it helps us to understand the social and cultural structure of pre-modern past.
For example, Charlie Chaplin's Great Dictator tells us a great deal about dictatorship era of Adolf Hitler.