Arianism is a sect that existed in the Christian world between 318-381, but was declared heretical because of its views that deviated from the orthodox line regarding the deity of Jesus. The Nicaean-Constantinopolitan credo, which is the faith formula accepted by almost all Christians today, was accepted as a result of the discussions caused by this sect. In this faith formula, Jesus is in the same position as the Father in terms of Godhead; the founder of the sect, Arius (d. 336), gave the Son a lower position than the Father, reducing him to the status of a demigod. The importance of the doctrinal dimension of the debate is indisputable; however, the fact that Arianism emerged in the fourth century, when Christianity was officially accepted by Constantine and became the official religion of the Roman Empire, makes the debate interesting in terms of church-political relations. Emperors were now directly involved in the doctrinal debates of a minority religion that had been oppressed and persecuted in the first three centuries, and were trying to resolve the issues by convening official councils using the imperial budget. Indeed, the reason for the first ecumenical council in Nicaea was to resolve the debate caused by the Arians. The small work in your hand is the first study in Turkish that comprehensively addresses the doctrinal and political dimensions of the sect.