In 314, seven years later, his Edict of Milan ensured tolerance for Christians throughout the Roman Empire. In 330 CE Constantine renamed Byzantium the New Rome and made it his capital. And then, in 380 CE, Christianity became the sole authorized official religion of Rome and its empire. Roughly a decade after that, in 391 CE, Emperor Theodosius forbade the practice of all religions except Christianity. No longer was the Roman Empire to tolerate all non-threatening religions.