Why was the Roman Empire difficult to govern?

It was located near Byzantium.

It was divided into four official districts.

It was organized around the Christian religion.

It was large and spread across three continents.

It was large and spread across three continents

Explanation:

The Empire was just so huge that it simply could not control all these areas securely at the same time and had to also fight off other countries and crush rebellions that added to the mess.