he had to do two things that's all I know.
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To convert to Christianity and to move the capital of the Roman Empire to his new city of Constantinople.
Diocletian's Caesar was and Maximian's Caesar was. When the two Augusti abdicated in 305 Galerius and Constantius I became Augusti. However, things quickly became complicated. Constantius died in 306 and Galerius appointed Severus (sometimes known as Severus II) as Augustus of the west. Maxentius, the son of Maximian, rebelled and proclaimed himself emperor in the west. Severus died in 307 in the fighting against Maxentius. Galerius refused to acknowledge Maxentius and nominated Licinius Augustus of the west in 308. Galerius died in 311.Licinus, who remained Augustus of the west, agreed with Maximinus II Daia to share the provinces of the east with him and took the European ones. However, Maximinus made an alliance with Maxentius. This forced Licinius to make an alliance with Constantine the Great (Constantius' son) whose troops in Britannia had proclaimed him as Augustus and whose proclamation was also acknowledged in Gaul. Constantine defeated Maxentius in a civil was in 312 and became Augustus of the west. After this there was a civil war between Constantine and Licinius from 316 to 324. Constantine won and became sole emperor.
i don't have the foggiest idea
The eastern and western parts of the Roman Empire were two parts of a sole Roman Empire and never attacked each other. They did not attack each other because they were part of the same empire. In fact there ware alternations of periods with co-emperors (with one in charge of the east and one in charge of the west) and periods with a sole emperor for the whole of the empire. In 307 Galerius, the senior emperor in the eastern part, attacked Maxentius, a usurper emperor in Italy. However, this was not an attack of the east on the west. It was an attempt to deal with usurpation. Finding himself in a vulnerable position, Galerius did not engage Maxentius, withdrew from Italy and proclaimed Licinius as senior emperor in the west and Constantine as junior emperor in the west. Maxentius was eventually defeated by Constantine, who, after winning a civil war against Licinius (who had become senior emperor of the eastern part of the empire after the defeat of Maxentius) became the sole emperor of the whole Roman Empire. Theodosius I attacked Magnus Maximus a usurper emperor who took over the provinces of the western part of the Roman Empire except for Italy. Theodosius won. After this the emperor of the western part of the empire, Valentinian II, was found hanging in his room and there was another usurper emperor, Eugenius. Theodosius defeated him and became the sole emperor of the whole of the Roman Empire.
No. Constantine defeated a rival general named Severus to become Emperor of Rome. In fact, Diocletian was the first emperor to abdicate, and he lived out the rest of his life quietly.
There was no such thing as a United Roman Empire, no such title ever occurred. There was always just one title: Roman Empire. This empire was never divided. There had been alternations of periods of co-emperorship and periods with a sole emperor. In the early days of co-emperorship, this involved an emperor in charge of the east or west and his son in charge of the other part as a co-emperor. Later there were times when the co-emperors were brothers. Not long before Constantine's bid for power, the emperor Diocletian created the tetrarchy (rule by four) where the empire was ruled by two senior emperors (Augusti, plural, Augustus, singular) and two junior emperors (Caesar(s)). Each of these men was in charge of one the four administrative units of the empire which Diocletian had created: the praetorian prefectures. These were subunits of a sole empire. Constantine was the sole emperor of the Roman Empire for thirteen years, from 324 to his death in 337. In 306 Constantine became the Caesar of the praetorian prefecture of Galliae (Britain, Gaul and Hispania). In 309 he declared himself Augustus of the west, but was not actually in charge of the whole of the west because Maxentius, a usurper, was in charge of the praetorian prefecture of Italia et Africa. In 312 Constantine defeated Maxentius in a civil war and became effectively the Augustus of the west until 324. In 324 he won a civil war against his co-emperor, Licinius, the Augustus of the east, and become sole emperor.