Answer:
By Researching ancient ruins
Step-by-step explanation:
In order to have better understanding on history, many Italian Scholars set up several anthropology expeditions to study the ancient ruins that were left over by the empires in the past.
From this expedition, they managed to find various types of artworks, literature, scripture, etc.
All of those things above often contained information's that the scholars can use to decipher Roman and Greek's society situation in the past. They served as pieces of puzzles that complete their knowledge about their history.