When Emperor Constantine had reconquered Rome under the banner of the cross in 312, he soon afterwards issued the Edict of Milan in 313, declaring the legality of Christianity in the Roman Empire. In addition, Constantine officially shifted the capital of the Roman Empire from Rome to the Greek town of Byzantium, which he renamed Constantinople ("City of Constantine"). In 395 Theodosius I, who had made Christianity the official religion of the Roman Empire, would be the last emperor to preside over a united Roman Empire, and from thenceforth, the empire would be split into two halves: the Western Roman Empire centered in Ravenna, and the Eastern Roman Empire (later to be referred to as the Byzantine Empire) centered in Constantinople. The Western Roman Empire was repeatedly attacked by marauding Germanic tribes (see: Migration Period), and in 476 finally fell to the Heruli chieftan Odoacer. Roman authority in the West completely collapsed and the western provinces soon became a patchwork of Germanic kingdoms. However, the city of Rome, under the guidance of the Roman Catholic Church, still remained a centre of learning, and did much to preserve classic Roman thought in Western Europe. In the meantime, the Roman emperor in Constantinople, Justinian I, had succeeded in codifying all Roman law into the Corpus Juris Civilis (529-534). For the duration of the 6th century, the Eastern Roman Empire was embroiled in a series of deadly conflicts, first with the Persian Sassanid Empire (see Roman-Persian Wars), followed by the onslaught of the arising Islamic Caliphate (Rashidun and Umayyad). By 650, the provinces of Egypt, Palestine and Syria were lost to the Muslim forces, followed by Hispania and southern Italy in the 7th and 8th centuries (see Muslim conquests).
In Western Europe, a political structure was emerging: in the power vacuum left in the wake of Rome's collapse, localised hierarchies were based on the bond of common people to the land on which they worked. Tithes were paid to the lord of the land, and the lord owed duties to the regional prince. The tithes were used to pay for the state and wars. This was the feudal system, in which new princes and kings arose, the greatest of which was the Frank ruler Charlemagne. In 800, Charlemagne, reinforced by his massive territorial conquests, was crowned Emperor of the Romans (Imperator Romanorum) by Pope Leo III, effectively solidifying his power in western Europe. Charlemagne's reign marked the beginning of a new Germanic Roman Empire in the west, the Holy Roman Empire. Outside his borders, new forces were gathering. The Kievan Rus' were marking out their territory, a Great Moravia was growing, while the Angles and the Saxons were securing their borders.
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