Who built city of constantinople?

The city of Constantinople was founded by the Roman Emperor Constantine the Great in 330 AD. He established it as the new capital of the Roman Empire, strategically located on the Bosporus Strait to control trade and military routes between Europe and Asia. The city was originally known as Byzantium before its renaming in honor of Constantine. Its construction and expansion continued under subsequent emperors, making it a significant cultural and political center for centuries.