Answer:
The people of the Byzantine Empire were mostly Greek, not Roman but since the Empire spanned across many regions, they were from other nations as well.
The Empire spanned across Africa, Asia, and Europe (lands that are not Greek or Roman therefore being multicultural) with, at its height, 1.5 million square miles. It had a population of around 26 million people. The Empire also lasted for over a thousand years, so to ask how it was multicultural is somewhat ignorant and pointless.
Explanation:
change it to your own words so it doesn't look like you cheated lol