of Nicaea (325) Arianism would not be contained within the Alexandrian diocese. By the time Bishop Alexander finally acted against his presbyter, Arius's doctrine had spread far beyond his own see; it had become a topic of discussion—and disturbance—for the entire Church. The Church was now a powerful force in the Roman world, with Constantine I having legalized it in 313 through the Edict of Milan. "Constantine desired that the church should contribute to the social and moral strength of the empire, religious dissension was a menace to the public welfare." Consequently, the emperor had taken a personal interest in several ecumenical issues, including the Donatist controversy in 316. He also wanted to bring an end to the Arian dispute. To this end, the emperor sent bishop Hosius of Corduba to investigate and, if possible, resolve the controversy. Hosius was armed with an open letter from the Emperor: "Wherefore let each one of you, showing consideration for the other, listen to the impartial exhortation of your fellow-servant." As the debate continued to rage despite Hosius' efforts, Constantine in AD 325 took an unprecedented step: he called an ecumenical council at Nicaea composed of church prelates from all parts of the empire to resolve this issue, possibly at Hosius' recommendation. It is traditionally said that 318 bishops came to Nicaea to attend the council, though others suggest figures from 250 to 300. The vast majority of those bishops were from the East. Italy, Spain, Gaul, North Africa, Persia, and Scythia each sent one bishop. The Bishop of Rome, Sylvester I, himself too aged to attend, sent two priests as his delegates. Arius himself attended the council as well as the young deacon Athanasius, who attended as an assistant to Alexander of Alexandria and who would become the champion of the Nicene Creed and spend most of his life battling Arianism and other form of Unitarianism. Also there were Eusebius of Caesarea and Eusebius of Nicomedia. Before the main conclave convened, Hosius initially met with Alexander and his supporters at Nicomedia. The council was presided over by the emperor himself, who participated in and even led some of its discussions. Those who upheld the notion that Christ was co-eternal and con-substantial with the Father were led by the young archdeacon Athanasius. Those who instead insisted that the Son of God came after God the Father in time and substance, were led by