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Attitude towards pagans

Modern scholarship indicates that paganism was a lesser concern than heresy for Christians in the fourth and fifth centuries, including Ambrose, but it was still a concern. Writings of this period were commonly hostile and often contemptuous toward paganism which Christianity saw as already defeated in Heaven. The great Christian writers of the third to fifth centuries attempted to discredit the continuation of these "defeated practices" by searching pagan writings, "particularly those of Varro, for everything that could be regarded by Christian standards as repulsive and irreligious." Ambrose' work reflects this triumphalism.

Throughout his time in the episcopate, Ambrose was active in his opposition to any state sponsorship of pagan cults. When Gratian ordered the Altar of Victory to be removed, it roused the aristocracy of Rome to send a delegation to the emperor to appeal against the decision, but Pope Damasus I induced Christian senators to petition against it, and Ambrose blocked the delegates from obtaining an audience with the emperor. Under Valentinian II, an effort was made to restore the Altar of Victory to its ancient station in the hall of the Roman Senate and to again provide support for the seven Vestal Virgins. The pagan party was led by the refined senator Quintus Aurelius Symmachus, who used all his prodigious skill and artistry to create a marvellous document full of the maiestas populi Romani. Hans Lietzmann writes that "Pagans and Christians alike were stirred by the solemn earnestness of an admonition which called all men of goodwill to the aid of a glorious history, to render all worthy honour to a world that was fading away".

Then Ambrose wrote to Valentinian asserting that the emperor was a soldier of God – not simply a personal believer, but one bound by his position to serve the faith; under no circumstances could he agree to something that would promote the worship of idols. Ambrose held up the example of Valentinian's brother, Gratian, reminding Valentinian that the commandment of God must take precedence. The bishop's intervention led to the failure of Symmachus' appeal.

In 389, Ambrose stepped in against a pagan senatorial delegation who wished to see the emperor Theodosius I. Although Theodosius refused their requests, he was irritated at the bishop's presumption and refused to see him for several days. Later, Ambrose wrote a letter to the emperor Eugenius complaining that some gifts the latter had bestowed on pagan senators could be used for funding pagan cults.