Alexandria became the centre of the first great schism in the Christian world, between the Arians, named for the Alexandrian priest Arius, and their opponents, represented by Athanasius, who became Archbishop of Alexandria in 326 after the First Council of Nicaea rejected Arius's views. The Arian controversy caused years of riots and rebellions throughout most of the 4th century. In the course of one of these, the great temple of Serapis, the stronghold of paganism, was destroyed. Athanasius was alternately expelled from Alexandria and reinstated as its Archbishop between five and seven times. Another religious development in Egypt was the monasticism of the Desert Fathers, who renounced the material world in order to live a life of poverty in devotion to the Church.