Julius I (337-352) was one of the first bishops of Rome to benefit from the imperial sponsorship of Christianity. Elected to oce in the winter of 337, just six weeks before the death of Constantine the Great, he participated in a moment of expansion of the Church Triumphant. Within his own see, he furthered the monumentalization of spaces devoted to public worship and the growth of the clergy, processes already well underway during the reign of his predecessor. Beyond Rome, he reinforced the prestige and influence of the Apostolic See by intervening in the major church political and doctrinal...