Constantine the Great Flavius Valerius Constantinus, Roman Emperor of Illyrian Origin
Gaius Flavius Valerius Aurelius Constantinus[1] (February 27, 272–May 22, 337), commonly known as Constantine I, Constantine the Great, or (among Eastern Orthodox and Eastern Catholic[2] Christians) Saint Constantine, was a Roman Emperor, proclaimed Augustus by his troops on July 25, 306 and who ruled an ever-growing portion of the Roman Empire until his death.
Constantine is best remembered in modern times for the Edict of Milan in 313, which fully legalized Christianity in the Empire, for the first time, and the Council of Nicaea in 325; these actions are considered major factors in the spreading of the Christian religion. His reputation as the "first Christian Emperor" has been promulgated by historians from Lactantius and Eusebius of Caesarea to the present day; although there has been debate over the veracity of his faith because he was baptized only on his death bed.[3]
Bronze statue of Constantine I in York, England, near the spot where he was proclaimed Emperor in 306.Early life
Constantine was born at Naissus (modern Niš, Serbia, ancient Illyria) in the province of Moesia Superior on 27 February 272 or 273, to Roman general, Constantius Chlorus, and his first wife Helena, an innkeeper's daughter who at the time was only sixteen years old. His father left his mother around 292 to marry Flavia Maximiana Theodora, daughter or step-daughter of the Western Roman Emperor Maximian. Theodora would give birth to six half-siblings of Constantine, including Julius Constantius.
Young Constantine served at the court of Diocletian in Nicomedia, after the appointment of his father as one of the two caesares (junior emperors) of the Tetrarchy in 293. In 305, both augusti (senior emperors), Diocletian and Maximian, abdicated, and Constantius succeeded to Maximian's position of western augustus. Although two legitimate sons of emperors were available (Constantine and Maxentius, the son of Maximian), both of them were ignored in the transition of power. Instead, Severus and Maximinus Daia were made caesares. Constantine subsequently left Nicomedia to join his father in Roman Gaul. However, Constantius fell sick during an expedition against the Picts of Caledonia, and died on July 25, 306 in Eboracum (York). The general Chrocus, of Alamannic descent, and the troops loyal to Constantius' memory immediately proclaimed Constantine an augustus.
Under the Tetrarchy, Constantine's succession was of dubious legitimacy. While Constantius as senior emperor could "create" a new caesar, Constantine's (or, his troops') claim to the title of augustus ignored the system of succession established in 305. Accordingly, Constantine asked Galerius, the eastern augustus, to be recognized as heir to his father's throne. Galerius granted him the title of caesar, confirming Constantine's rule over his father's territories, and promoted Severus to augustus of the West.
Ruler of the West
Constantine's share of the empire comprised of Britain, Gaul, the Germanic provinces, and Spain. He therefore commanded one of the largest Roman armies, stationed along the important Rhine frontier. While Gaul was one of the richer regions of the empire, it had suffered much during the Crisis of the Third Century. Many areas were depopulated, the cities ruined. During his years in Gaul, from 306 to 316, Constantine continued his father's efforts to secure the Rhine frontier and rebuild the Gallic provinces. His main residence during that time was Trier.
Immediately after his promotion to emperor, Constantine abandoned his father's British campaign and returned to Gaul to quell an uprising by Franks. Another expedition against Frankish tribes followed in 308. After this victory, he began to build a bridge across the Rhine at Cologne to establish a permanent stronghold on the right bank of the river. A new campaign in 310 had to be abandoned because of Maximian's rebellion (below). The last of Constantine's wars on the Rhine frontier took place in 313, after his return from Italy, and saw him again victorious. Constantine's main goal was stability, and he tried to achieve that by immediate, often brutal punitive expeditions against rebellious tribes, demonstrating his military power by conquering the enemies on their own side of the Rhine frontier, and slaughtering many prisoners during games in the arena. The strategy proved successful, as the Rhine frontier remained relatively quiet during the rest of Constantine's reign.
In the interior conflicts of the Tetrarchy, Constantine tried to remain neutral. In 307, the senior emperor Maximian (recently returned to the political scene after his abdication in 305) visited Constantine to get his support in the war of Maxentius against Severus and Galerius. Constantine married Maximian's daughter Fausta to seal the alliance and was promoted to Augustus by Maximian. He didn't interfere on Maxentius' behalf, though. Maximian returned to Gaul in 308 after he had failed to depose his son. At the conference of Carnuntum, where Diocletian, Galerius and Maximian met later that year, Maximian was forced to abdicate again and Constantine reduced to caesar. In 309, Maximian rebelled against his son-in-law while Constantine was campaigning against the Franks. The rebellion was quickly quelled, and Maximian was killed or forced to commit suicide. Both Constantine and Maximinus Daia were disappointed over their relegation to caesar and Licinius' appointment, and subsequently defied that ruling and styled themselves Augustus, which was granted to them by Galerius in 310, thus officially creating four Augusti. With Galerius' death in 311, the last ruler with enough authority interested in continuing the tetrarchy left the stage, and the system rapidly declined. In the struggle for power that ensued, Constantine allied himself with Licinius, while Maximinus approached Maxentius, who was still officially regarded as an usurper.
312-324
Early in 312, Constantine crossed the Alps with his army and attacked Maxentius. He quickly conquered Northern Italy in the battles of Turin and Verona and then moved on to Rome. There he defeated Maxentius in the Battle of Milvian Bridge, which resulted in his becoming Western Augustus, or ruler of the entire Western Roman Empire. During the next years, he gradually consolidated his military superiority over his rivals in the crumbling Tetrarchy.
In 313, he met Licinius in Milan to secure their alliance by the marriage of Licinius and Constantine's half-sister Constantia. During this meeting, the emperors agreed on the so-called Edict of Milan, officially granting full tolerance to all religions in the empire, especially Christianity. The conference was cut short, however, when news reached Licinius that his rival Maximinus Daia had crossed the Bosporus and invaded Licinian territory. Licinius departed and eventually defeated Maximinus, gaining control over the entire eastern half of the Roman Empire. Relations between the two remaining emperors declined, though, and either in 314 or 316, Constantine and Licinius fought gainst one another in the war of Cibalae, with Constantine being victorious. They clashed again in the Battle of Campus Ardiensis in 317, and agreed to a settlement in which Constantine's sons Crispus and Constantine II, and Licinius' son Licinianus were made caesars.
In the year 320, Licinius reneged on the religious freedom promised by the Edict of Milan in 313 and began another persecution of the Christians. It became a challenge to Constantine in the west, climaxing in the great civil war of 324. Licinius, aided by Goth mercenaries, represented the past and the ancient faith of Paganism. Constantine and his Franks marched under the Christian standard of the labarum, and both sides saw the battle in religious terms. Supposedly outnumbered, but fired by their zeal, Constantine's army emerged victorious in the battles of Adrianople, the Hellespont, and at Chrysopolis. With the defeat and death of Licinius a year later (he was accused of plotting against Constantine and executed), Constantine then became the sole emperor of the entire Roman Empire.[4]
more info: http://en.wikipedia.org/wiki/Constantine_I_(emperor)