Answer:Perhaps the most important was the existence of feudalism. Feudalism was a social, economic and political system where a vassal held a fief (a piece of land) and owed allegiance to a lord. Another difference was the emergence of chivalry as a code of conduct for a type of soldier called a knight.
Step-by-step explanation:
The main similarity between the Roman society and the Middle Ages was the similar social hierarchy that took place but also how this social class played in part with the economy of each society.