What did emperor constitatine do?

Emperor Constantine, who ruled from 306 to 337 AD, is best known for being the first Roman emperor to convert to Christianity and for issuing the Edict of Milan in 313 AD, which granted religious tolerance to Christians. He also founded the city of Constantinople (modern-day Istanbul), which became the new capital of the Roman Empire and a major center for Christianity. Additionally, Constantine played a crucial role in the Council of Nicaea in 325 AD, which sought to address theological disputes within Christianity. His reign marked a significant turning point in the relationship between the Roman Empire and Christianity.