section_path: History/Fall of the Western Roman Empire
section_name: Fall of the Western Roman Empire
paragraph_text: Fall of the Western Roman Empire
  
  In the late 4th and 5th centuries the Western Empire entered a critical stage which terminated with the fall of the Western Roman Empire. Under the last emperors of the Constantinian dynasty and the Valentinianic dynasty, Rome lost decisive battles against the Sasanian Empire and Germanic barbarians: in 363, emperor Julian the Apostate was killed in the Battle of Samarra, against the Persians and the Battle of Adrianople cost the life of emperor Valens (364–378); the victorious Goths were never expelled from the Empire nor assimilated. The next emperor, Theodosius I (379–395), gave even more force to the Christian faith, and after his death, the Empire was divided into the Eastern Roman Empire, ruled by Arcadius and the Western Roman Empire, commanded by Honorius, both of which were Theodosius' sons.
  
  The situation became more critical in 408, after the death of Stilicho, a general who tried to reunite the Empire and repel barbarian invasion in the early years of the 5th century. The professional field army collapsed. In 410, the Theodosian dynasty saw the Visigoths sack Rome. During the 5th century, the Western Empire experienced a significant reduction of its territory. The Vandals conquered North Africa, the Visigoths claimed the southern part of Gaul, Gallaecia was taken by the Suebi, Britannia was abandoned by the central government, and the Empire suffered further from the invasions of Attila, chief of the Huns. General Orestes refused to meet the demands of the barbarian "allies" who now formed the army, and tried to expel them from Italy. Unhappy with this, their chieftain Odoacer defeated and killed Orestes, invaded Ravenna and dethroned Romulus Augustus, son of Orestes. This event of 476, usually marks the end of Classical antiquity and beginning of the Middle Ages. The Roman noble and former emperor Julius Nepos continued to rule as emperor from Dalmatia even after the deposition of Romulus Augustus until his death in 480. Some historians consider him to be the last emperor of the Western Empire instead of Romulus Augustus.
  
  After 1200 years of independence and nearly 700 years as a great power, the rule of Rome in the West ended. Various reasons for Rome's fall have been proposed ever since, including loss of Republicanism, moral decay, military tyranny, class war, slavery, economic stagnation, environmental change, disease, the decline of the Roman race, as well as the inevitable ebb and flow that all civilisations experience.The Eastern Empire survived for almost 1000 years after the fall of its Western counterpart and became the most stable Christian realm during the Middle Ages. During the 6th century, Justinian reconquered the Italian peninsula from the Ostrogoths, North Africa from the Vandals, and southern Hispania from the Visigoths. But within a few years of Justinian's death, Eastern Roman (Byzantine) possessions in Italy were greatly reduced by the Lombards who settled in the peninsula. In the east, partially due to the weakening effect of the Plague of Justinian as well as a series of mutually destructive wars against the Persian Sassanian Empire, the Byzantine Romans were threatened by the rise of Islam. Its followers rapidly brought about the conquest of the Levant, the conquest of Armenia and the conquest of Egypt during the Arab–Byzantine wars, and soon presented a direct threat to Constantinople. In the following century, the Arabs captured southern Italy and Sicily. In the west, Slavic populations penetrated deep into the Balkans.
  
  The Byzantine Romans, however, managed to stop further Islamic expansion into their lands during the 8th century and, beginning in the 9th century, reclaimed parts of the conquered lands. In 1000 AD, the Eastern Empire was at its height: Basil II reconquered Bulgaria and Armenia, and culture and trade flourished. However, soon after, this expansion was abruptly stopped in 1071 with the Byzantine defeat in the Battle of Manzikert. The aftermath of this battle sent the empire into a protracted period of decline. Two decades of internal strife and Turkic invasions ultimately led Emperor Alexios I Komnenos to send a call for help to the Western European kingdoms in 1095. The West responded with the Crusades, eventually resulting in the Sack of Constantinople by participants of the Fourth Crusade. The conquest of Constantinople in 1204 fragmented what remained of the Empire into successor states; the ultimate victor was the Empire of Nicaea. After the recapture of Constantinople by Imperial forces, the Empire was little more than a Greek state confined to the Aegean coast. The Eastern Roman (Byzantine) Empire collapsed when Mehmed the Conqueror conquered Constantinople on 29 May 1453.