Caesarea Eusebius and some Cristian sources noted that Constantine had experienced a striking event in 312 at the Battle of the Milvian Bridge, and after that Constantine wanted to be sovereign empire of the West.In accordance with these sources, Constantine looked at the sun before the war and saw a glowing cross on it and saw some Greek words which mean a sign of victory. Constantine ordered his soldiers to decorate their protective shields with the symbol which represents Christianity and after that Constantine and his soldiers became victorious side .After the war, the new emperor came to ignore the altar of the gods prepared in the Capitoline, and did not make traditional sacrifices to celebrate a triumphant Roman entry, rather than going directly to the empire’s palace.Nevertheless, the most powerful people of the empire, especially the superior army officials, did not transform into Christianity and became member of a Roman traditional religions; Constantine’s rule seemed at least willing to comfort these groups.After the war , Roman coins included the Roman Gods and this situation took 8 years. The memorials that be builded, like the Arch of Constantine, did not contain any signs about the Christianity. Constantine and Licinius declared that it is right that each of the Christians and others must have the freedom to believe the best-appearing religion in 313 so he tolerated beliefs which are Christianity and other religions.Milano Edict took the previous Galerius’ Tolerance Ferman a step forward in 311 and ?confiscated the Church goods.Milano Edict is declaration for tolerance of Christianity in the Roman Empire.The Roman emperors concluded a political agreement between Constantine I and Licinius in Milan on February 313. In June 313 Licinius declared to Eastern Rome that everyone had the rights to worship God they wanted. Christians thus have legal rights, including the establishment of churches. According to Fermanians, the property seized in the state would be returned to the Christians immediately.Constitution of Constantine I, and an alleged religious order in the Roman Empire; in fact, is a breakdown of the negotiations between Licinius and Constantine in Milan, a legitimate document, a complete breakdown of the freedom of the nobility, the compensation of the sufferings of Christians, and so on.