The problem that Diocletian faced was that more military barrier had to be created in which the Empire cannot support its cost. The taxes were increased which leads to inflation causing the rise of the prices of commodity which causes the leaders to become unfavorable to the people. The Role of Constantine in the Fall of Rome Constantine became Emperor from AD 307 to AD 337 and he tolerated religion in the Roman Empire although he was not a Christian himself, he gave rights to the Christians. He did not taken into consideration that the new monotheistic religion was at odds with the pagan cults of the emperors.
He also moved the capital to a new city Constantinople since he believed that Rome as a city was to far from the fundamental areas from a government level, this move was a bad one since it left the western empire vulnerable. The western empire was attacked by the Ostrogoths thru the eastern empire and the western Empire was attacked by the Goths, Franks, Visigoths and Burgundians. The Germanic Barbarians The Germans were exposed to the Roman world by border trade and serving as support to the Roman legions of the empire. The admittance of the barbarians in the army gave way for the complete “germanization” of the Roman army.
The internal crisis of the Roman Empire makes the things worst and the barbarians realized it and defeated the Romans in the battle of Adrianople in 378 where the Roman Empire fell. The Franks, Angles, and Saxons which are all German tribes have established their agricultural life, the other tribes like the Goths, Vandals, and Lombards were nomadic but compared to the Romans they were less advanced. Romulus Augustulus was the last Roman emperor in the west and was replaced by the leader of Goths, Odoacer in AD 476 which was also the end of the Roman Empire.