Question

this roman ruler moved the capital of the roman empire to constantinople, modern day istanbul
justinian
julius caesar
constantine
scipio africanus

Explanation:

Constantine I, also known as Constantine the Great, established Constantinople (modern Istanbul) as the new capital of the Roman Empire in the 4th century CE. Justinian focused on reconquest and law codification, Julius Caesar was a republican-era dictator, and Scipio Africanus was a Roman general of the Punic Wars, none of whom moved the imperial capital to Constantinople.

Answer:

Constantine