This thesis analyzes the Christianisation process of the Roman Empire from the time of Constantine the Great to that of Justinian. The purposes of the ecumenical councils and the codes on the religious issues will be discussed in the framework of the religious policies of the emperors in that time. Between the time of Constantine and that of Justinian the Roman Empire became Christian Roman Empire. The Christianisation of the Roman Empire will be dealt with both from the religious and political point of view in this thesis.Bu çalışma Büyük Konstantin zamanından Justinianus zamanına kadar Roma İmparatorluğu’nun hristiyanlaşma sürecini incelemiştir. Dini konular üzerine olan genel konsillerin ve kanunların amaçları imparatorların din politika...