Question

Why was Constantinople called the "New Rome"?

Answer 1

the byzantines still kept a lot of roman culture/traditions and even considered themselves romans even after rome fell.

Answer 2

Byzantium took on the name of Konstantinoupolis ("city of Constantine",Constantinople) after its re-foundation under Roman emperor Constantine I, who transferred the capital of the Roman Empire from Rome to Byzantium in 330 AD and designated his new capital officially as Nova Roma (Νέα Ῥώμη) 'New Rome'.