After ten years of civil war, where did constantine establish the capital of the eastern empire

In 330 A.D., Roman Emperor Constantine I chose Byzantium as the site of a “New Rome” with an eponymous capital city, Constantinople. Five years earlier, at the Council of Nicaea, Constantine had established Christianity—once an obscure Jewish sect—as Rome's official religion.Aug 24, 2010

The answer is a)advocates of divine right.

An attractive economy.