It is commonly believed that if there had been no Arianism, i.e., the denial of the divinity of Jesus, it would be very difficult to write the lives of many early saints.
Eusebius of Vercelli, is one of the great apologists (defenders of the faith) during the trying times of the Church. He was born in the Isle of Sardinia, where he became a member of the Roman clergy. He is acknowledged as the first recorded bishop of Vercelli in Piedmont, Northwest of Italy. He was also the first to link the monastic life with that of the diocesan clergy life – living the principle that the best way to sanctify the people is by having them see a clergy formed in solid virtue and living in community.