The Council of Nicaea convened to decide the guiding rules of the church - and to resolve the questions posed by Arian theology. A deacon named Athanasius set himself against Arius and succeeded in getting his teachings declared heresy. Disclaimer: This series is intended for students, to give them a broad overview of a complicated subject that has driven world history for centuries. Our story begins and focuses on Rome. Constantine called the Council of Nicaea not only to address the teachings of Arius, but also to decide basic matters for how the church would go forward. Yet it was the debate over Arian theology which quickly came to dominate the council's time. The bishops effectively split into two factions, one backing Arius and the other led by a deacon named Athanasius. Athanasius vehemently opposed the Arian teachings and would not allow any compromise to be formed with the other group. Yet he played the politics very carefully, adopting in his own arguments the phrase "homoousian" (or "of the same substance") to describe the relationship between the Father and the Son, knowing full well that Arius would never accept an agreement which included this idea. Even when others tried to compromise with the phrase "homoiousian" (or "of similar substance"), Arius would not agree. Athanasius used the extra time to make private deals and assemble a majority coalition, with which he successfully caused Arianism to be declared heresy and forced Arius himself into exile. Emperor Constantine was just happy a decision had been reached, but a bishop in his own court would not let matters rest so easily. This bishop, Eusebius, campaigned tirelessly for the restoration of Arius and managed to get Athanasius exiled instead. Constantine himself wound up being baptized by Eusebius, and his son Emperor Constantius II would be a die-hard Arian in his turn. Eusebius even ordained a Goth named Ulfilas to preach to the Gothic tribes, and his sucess meant that the tribes became