How did Constantinople become the sole capital city of the Roman Empire?

Constantinople is an ancient city in modern-day Turkey that’s now known as Istanbul. First settled in the seventh century B.C., Constantinople developed into a thriving port thanks to its prime geographic location between Europe and Asia and its natural harbor. In 330 A.D., it became the site of Roman Emperor Constantine’s “New Rome,” a Christian city of immense wealth and magnificent architecture. Constantinople stood as the seat of the Byzantine Empire for the next 1,100 years, enduring periods of great fortune and horrific sieges, until being overrun by Mehmed II of the Ottoman Empire in 1453.

First settled in the seventh century B.C., Constantinople developed into a thriving port thanks to its prime geographic location between Europe and Asia and its natural harbor. In 330 A.D., it became the site of Roman Emperor Constantine's “New Rome,” a Christian city of immense wealth and magnificent architecture.

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it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

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