The answer is amendment 4 I'm pretty sure
Saving graeco-roman culture
<span>❏ </span><span> rebuilt the Greek city of Byzantium</span>
<span>❏ </span>renamed
it Constantinople
<span>❏ </span>while
emperor, Constantine made the Byzantine Empire thrive and become powerful
<span>❏ </span>he also
embraced Christianity
That person is called an IMMIGRANT