Two events were of fundamental importance to the development of a unique, Byzantine art. First, the Edict of Milan, issued by the emperors Constantine I and Licinius in 313, allowed for public Christian worship, and led to the development of a monumental, Christian art. Second, the dedication of Constantinople in 330 created a great new artistic centre for the eastern half of the Empire, and a specifically Christian one. Other artistic traditions flourished in rival cities such as Alexandria, Antioch, and Rome, but it was not until all of these cities had fallen - the first two to the Arabs and Rome to the Goths - that Constantinople established its supremacy.