Question

The byzantine gained the most territory in the ​

Answer 1

Roman western Mediterranean coast, including north Africa, Italy, and Rome itself, which it held for two more centuries.

Answer 2

Sixth century, when Justinian I was emperor

Step-by-step explanation:

During the reign of Justinian I (r. 527–565), the Empire reached its greatest extent after reconquering much of the historically Roman western Mediterranean coast, including north Africa, Italy, and Rome itself, which it held for two more centuries.