In the meanwhile the vigour and audacity of the Barbarians did but increase. The town of Verona was looked upon as one of the keys of Upper Italy, protected as it was by the river Adige and fortified besides by walls and fortifications. Considered as a stronghold, even in the days of Augustus, its renown in that respect was but to gain ground as time went on. The Emperor Gallienus had extended the outer city walls, and in this way had rendered the town almost impregnable against the attacks of the Barbarians. This extension of the walls had been made to include the Amphitheatre, an edifice which might well be of untold advantage to a foe; for unless rescued from its outlying position it could easily be taken and turned into a formidable fort by any enemy of skill and daring. This strengthening of the walls and fortifications of Verona was accomplished none too soon. A vast federation of northern hordes, determined to take advantage of the corruption and feebleness of Rome, crossed the Alps in 268, and aimed at the conquest of Verona. They were met by the Emperor Claudius II. near the Lake of Garda, and overthrown in a great fight, when more than half their numbers were left dead on the field of battle.

In the year 312, Verona was besieged by Constantine, who bore down upon it from the pass of the Mount Cenis. Gibbon[2] gives an account of this event as follows: “From Milan to Rome the Aemilian and Flaminian highways offered an easy march of about four hundred miles; but though Constantine was impatient to encounter the tyrant (Maxentius), he prudently directed his operations against another army of Italians, who, by their strength and position, might either oppose his progress, or, in case of a misfortune, might intercept his retreat. Ruricius Pompeianus, a general distinguished by his valour and ability, had under his command the city of Verona, and all the troops that were stationed in the province of Venetia. As soon as he was informed that Constantine was advancing towards him, he detached a large body of cavalry, which was defeated in an engagement near Brescia, and pursued by the Gallic legions as far as the gates of Verona. The necessity, the importance, and the difficulties of the siege of Verona, immediately presented themselves to the sagacious mind of Constantine. The city was accessible only by a narrow peninsula towards the west, as the other three sides were surrounded by the Adige, a rapid river, which covered the province of Venetia, from whence the besieged derived an inexhaustible supply of men and provisions. It was not without great difficulty, and after several fruitless attempts, that Constantine found means to pass the river at some distance above the city, and in a place where the torrent was less violent. He then encompassed Verona with strong lines, pushed his attacks with prudent vigour, and repelled a desperate sally of Pompeianus. That intrepid general, when he had used every means of defence that the strength of the place or that of the garrison could afford, secretly escaped from Verona, anxious not for his own but for the public safety. With indefatigable diligence he soon collected an army sufficient either to meet Constantine in the field, or to attack him if he obstinately remained within his lines. The emperor, attentive to the motions, and informed of the approach of so formidable an enemy, left a part of his legions to continue the operations of the siege, whilst, at the head of those troops on whose valour and fidelity he more particularly depended, he advanced in person to engage the general of Maxentius. The army of Gaul was drawn up in two lines, according to the practice of war; but their experienced leader, perceiving that the numbers of the Italians far exceeded his own, suddenly changed his dispositions, and, reducing the second, extended the front of this first line to a just proportion with that of the enemy. Such evolutions, which only veteran troops can execute without confusion in a moment of danger, commonly prove decisive: but as this engagement began towards the close of the day, and was contested with great obstinacy during the whole night, there was less room for the conduct of the generals than for the courage of the soldiers. The return of light displayed the victory of Constantine, and a field of carnage covered with many thousands of the vanquished Italians. Their general, Pompeianus, was found among the slain; Verona immediately surrendered at discretion, and the garrison was made prisoners of war.”

Aquileja and Modena surrendered also to the victor, and the path into Italy lay open to Constantine.

For the remaining part of that century Verona remained under the sway of the Emperors of the West, many of whom sojourned there often and willingly, attracted either by the charm of the place, or by the convenience afforded by its central position. Nor is this to be wondered at seeing how it was a very junction for Milan, Aquileja, and Germany in turn, and how it was also provided with all that was needful for the reception and accommodation of its Imperial guests.

In the following century the Veronese territory was invaded anew by Barbarians, the first inroad being that of Alaric and his Visigoths (402); the next that of the Huns under Attila. There can be little doubt that Verona fell before the armies of the “Scourge of God,” but his speedy withdrawal from Italy—at the intercession it is said of St Leo—left the town again free.

The influence exercised by Rome over Verona ever since she had included her among her colonies had been felt not only in the laws and habits adopted by the northern city, but also in the religious creeds and rites practised in her midst. The worship of false gods had flourished there in early times. Eastern deities had had their services and altars, nor was the Augustan worship omitted. That this worship, which represented not only the homage rendered to the person of Cæsar but to the world-power of Rome as well, was celebrated in Verona is evident from the mention made of the “flamen divi Augusti et Romae” as ranking among her religious observances.

The introduction of Christianity into Verona is placed at a very early date, and one legend declares that no less a person than St Peter appointed the first bishop who was one St Euprepio. This divine, who is also said to have been one of the seventy appointed by our Lord (see St Luke, ch. x., v. i), was indeed the first bishop of Verona, but the date of his episcopate cannot be definitely affirmed, and can only be vaguely spoken of as amongst the earliest bishoprics instituted in Italy. The first bishops of Verona all attained to the rank of saints; the fourth being St Procolo, and the sixth St Lucillo, who took part in 347 at the Council of Sardis. In 380 (or according to Maffei 390) occurred the death of St Zenone, or Zeno, the eighth bishop, a man famous for his learning and saintliness of life, and who according to some traditions “reduxit Veronam ad baptismum.” The writings of St Zeno have come down to the present day, and beside their doctrine and devotion have also some literary merit. It is not known where the services of the early Christians were held in Verona. The so-called grotto of San Nazzaro, of which mention will be made later on,[3] is generally looked upon as the place, and tradition has it that Divine worship was actually celebrated there. The frescoes that adorn the church are of later date than the building, and were