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The Crisis of the Third Century, also known as Military Anarchy or the Imperial Crisis, (AD 235–284) was a period in which the Roman Empire nearly collapsed under the combined pressures of invasion, civil war, plague, and economic depression. The Crisis began with the assassination of Emperor Alexander Severus at the hands of his own troops in 235, initiating a fifty-year period in which there were at least 26 claimants to the title of Emperor, mostly prominent Roman army generals, assuming imperial power over all or part of the Empire. Twenty-six men were officially accepted by the Roman Senate as emperor during this period, and thus became legitimate emperors. By 268, the Empire had split into three competing states: the Gallic Empire, including the Roman provinces of Gaul, Britannia and (briefly) Hispania; the Palmyrene Empire, including the eastern provinces of Syria Palaestina and Aegyptus; and the Italian-centered and independent Roman Empire, proper, between them. Later, Aurelian (270–275) reunited the empire; the Crisis ended with the ascension and reforms of Diocletian in 284. The Crisis resulted in such profound changes in the Empire's institutions, society, economic life and, eventually, religion, that it is increasingly seen by most historians as defining the transition between the historical periods of classical antiquity and late antiquity.〔Brown, P, ''The World of Late Antiquity,'' London 1971, p. 22.〕 ==History== The situation of the Roman Empire became dire in 235 CE, when emperor Alexander Severus was murdered by his own troops. Many Roman legions had been defeated during a campaign against Germanic peoples raiding across the borders, while the emperor was focused primarily on the dangers from the Sassanid Persian Empire. Leading his troops personally, Alexander Severus resorted to diplomacy and paying tribute in an attempt to pacify the Germanic chieftains quickly. According to Herodian this cost him the respect of his troops, who may have felt they should be punishing the tribes who were intruding on Rome's territory.〔" Herodian says "in their opinion Alexander showed no honourable intention to pursue the war and preferred a life of ease, when he should have marched out to punish the Germans for their previous insolence" (Herodian vi.7.10).〕 In the years following the emperor's death, generals of the Roman army fought each other for control of the Empire and neglected their duties in preventing invasions from foreigners. Provincials became victims of frequent raids by foreign tribes, such as the Carpians, Goths, Vandals, and Alamanni, along the Rhine and Danube Rivers in the western part of the Empire, as well as attacks from Sassanids in the eastern part of the Empire. Climate changes and a rise in sea levels ruined the agriculture of what is now the Low Countries, and forced tribes to relocate in order to find food.〔Southern, Pat (2011-02-17). "Third Century Crisis of the Roman Empire". BBC History, 17 February 2011. Retrieved from http://www.bbc.co.uk/history/ancient/romans/thirdcenturycrisis_article_01.shtml.〕 Additionally, in 251, the Plague of Cyprian (possibly smallpox) broke out, causing large-scale mortality which may have seriously affected the ability of the Empire to defend itself. After the loss of Valerian in 260, the Roman Empire was beset by usurpers, who broke it up into three competing states. The Roman provinces of Gaul, Britain and Hispania broke off to form the Gallic Empire. After the death of Odaenathus in 267, the eastern provinces of Syria, Palestine and Aegyptus became independent as the Palmyrene Empire, leaving the remaining Italian-centered Roman Empire-proper in the middle. An invasion by a vast host of Goths was beaten back at the Battle of Naissus in 268. This victory was significant as the turning point of the crisis, when a series of tough, energetic soldier-emperors took power. Victories by the emperor Claudius II Gothicus over the next two years drove back the Alamanni and recovered Hispania from the Gallic Empire. When Claudius died in 270 of the plague, Aurelian, who had commanded the cavalry at Naissus, succeeded him as the emperor and continued the restoration of the Empire. Aurelian reigned (270–275) through the worst of the crisis, defeating the Vandals, the Visigoths, the Palmyrenes, the Persians, and then the remainder of the Gallic Empire. By late 274, the Roman Empire was reunited into a single entity, and the frontier troops were back in place. More than a century would pass before Rome again lost military ascendancy over its external enemies. However, dozens of formerly thriving cities, especially in the Western Empire, had been ruined, their populations dispersed and, with the breakdown of the economic system, could not be rebuilt. Major cities and towns, even Rome itself, had not needed fortifications for many centuries; many then surrounded themselves with thick walls. Finally, although Aurelian had played a significant role in restoring the Empire's borders from external threat, more fundamental problems remained. In particular, the right of succession had never been clearly defined in the Roman Empire, leading to continuous civil wars as competing factions in the military, Senate, and other parties put forward their favoured candidate for emperor. Another issue was the sheer size of the Empire, which made it difficult for a single autocratic ruler to effectively manage multiple threats at the same time. These continuing problems would be radically addressed by Diocletian, allowing the Empire to continue to survive in the West for over a century and in the East for over a millennium. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Crisis of the Third Century」の詳細全文を読む スポンサード リンク
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