Meanwhile Constantine, after defeating the tyrant’sMaxentius, called tyrant because his sovereignty was not officially recognised. generals at Verona, went on to Rome. When he had reached the city, Maxentius came out and chose a plainSaxa Rubra, near the Mulvian Bridge. above the Tiber as the place to do battle. There the usurper was defeated, and when all his men were put to flight, he was prevented from escaping by the crowd of fugitives, thrown from his horse into the river, and drowned. On the following day his body was recovered from the Tiber, and the head was cut off and taken to Rome. When his mother was questioned about his parentage, she admitted that he was the son of a Syrian. He ruled for six years.The number is lacking in the text, but is known from the Panegyrics of Constantine and other sources. It was from 306–312.

Now Licinius was a native of New Dacia, and was of somewhat common origin. He was made emperorI.e., Augustus; see Introd. to Vol. I, p. xxv. He seems never to have been a Caesar. by Galerius, in order that he might take the field against Maxentius. But when Maxentius was overthrown and Constantine had recovered Italy, he made Licinius his colleague on condition that he should marry Constantine’s sister Constantia at Mediolanum. After the celebration of the wedding Constantine went to Gaul, and Licinius returned to Illyricum.

Some time after that Constantine sent ConstantiusHis son, the future emperor, Constantius II. to Licinius, to persuade him to confer the rank of Caesar on Bassianus, who was married to a second sister of Constantine (named Anastasia), to the end that, after the manner of Maximianus, Bassianus might hold Italy and thus stand as a buffer between Constantine and Licinius.

But Licinius thwarted such an arrangement, and influenced by Bassianus’ brother Senicio, who was loyal to Licinius, Bassianus took up arms against Constantine. But he was arrested in the act of accomplishing his purpose, and by order of Constantine was condemned and executed. When the punishment of Senicio was demanded as the instigator of the plot and Licinius refused, the harmony between the two emperors came to an end; an additional reason for the break was, that Licinius had overthrown the busts and statues of Constantine at Emona.Modern Laibach in Carinthia. Then the two emperors declared open war.

Their armies were led to the plain of Cibalae.Cf. Amm. xxx. 7, 2. Licinius had 35,000 infantry and cavalry; Constantine commanded 20,000. After an indecisive contest, in which 20,000 of Licinius’ foot soldiers and a part of his mail-clad horsemen were slain, he himself with a great part of his other cavalry made his escape under cover of night to Sirmium.

From there, taking with him his wife, his son, and his treasures, he went to Dacia and appointed Valens, who was commander on the frontier, to the rank of Caesar. Then, having through Valens mustered a large force at Hadrianopolis, a city of Thrace, he sent envoys to Constantine, who had established himself at Philippi, to treat for peace. When the envoys were sent back without accomplishing anything, the war was renewed and the two rivals joined battle on the plain of Mardia. After a long and indecisive struggle, the troops of Licinius gave way and night aided them to escape.