Medieval Shields

In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire and transitioned into the Renaissance and the Age of Discovery. The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period. The medieval period is itself subdivided into the Early, High, and Late Middle Ages.

Population decline, counterurbanisation, the collapse of centralized authority, invasions, and mass migrations of tribes, which had begun in late antiquity, continued into the Early Middle Ages. The large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the 7th century, North Africa and the Middle East—most recently part of the Eastern Roman (or Byzantine) Empire—came under the rule of the Umayyad Caliphate, an Islamic empire, after conquest by Muhammad's successors. Although there were substantial changes in society and political structures, the break with classical antiquity was not complete. The still-sizeable Byzantine Empire, Rome's direct continuation, survived in the Eastern Mediterranean and remained a major power. Secular law was advanced greatly by the ''Code of Justinian''. In the West, most kingdoms incorporated extant Roman institutions, while new bishoprics and monasteries were founded as Christianity expanded in Europe. The Franks, under the Carolingian dynasty, briefly established the Carolingian Empire during the later 8th and early 9th centuries. It covered much of Western Europe but later succumbed to the pressures of internal civil wars combined with external invasions: Vikings from the north, Magyars from the east, and Saracens from the south.

During the High Middle Ages, which began after 1000, the population of Europe increased greatly as technological and agricultural innovations allowed trade to flourish and the Medieval Warm Period climate change allowed crop yields to increase. Manorialism, the organisation of peasants into villages that owed rent and labour services to the nobles, and feudalism, the political structure whereby knights and lower-status nobles owed military service to their overlords in return for the right to rent from lands and manors, were two of the ways society was organised in the High Middle Ages. This period also saw the formal division of the Catholic and Orthodox churches, with the East–West Schism of 1054. The Crusades, which began in 1095, were military attempts by Western European Christians to regain control of the Holy Land from Muslims, and also contributed to the expansion of Latin Christendom in the Baltic region and the Iberian Peninsula. Kings became the heads of centralised nation states, reducing crime and violence but making the ideal of a unified Christendom more distant. In the West, intellectual life was marked by scholasticism, a philosophy that emphasised joining faith to reason, and by the founding of universities. The theology of Thomas Aquinas, the paintings of Giotto, the poetry of Dante and Chaucer, the travels of Marco Polo, and the Gothic architecture of cathedrals such as Chartres mark the end of this period.

The Late Middle Ages was marked by difficulties and calamities including famine, plague, and war, which significantly diminished the population of Europe; between 1347 and 1350, the Black Death killed about a third of Europeans. Controversy, heresy, and the Western Schism within the Catholic Church paralleled the interstate conflict, civil strife, and peasant revolts that occurred in the kingdoms. Cultural and technological developments transformed European society, concluding the Late Middle Ages and beginning the early modern period.

Terminology and periodisation

The Middle Ages is one of the three major periods in the most enduring scheme for analysing European history: Antiquity, the Middle Ages and the Modern Period.Power ''Central Middle Ages'' p. 3 A similar term first appears in Latin in 1469 as or "middle season". In early usage, there were many variants, including , or "middle age", first recorded in 1604, and , or "middle centuries", first recorded in 1625.Murray "Should the Middle Ages Be Abolished?" ''Essays in Medieval Studies'' p. 4 The adjective "medieval" (or sometimes "mediaeval"Flexner (ed.) ''Random House Dictionary'' p. 1194 or "mediæval"), meaning pertaining to the Middle Ages, derives from .

Medieval writers divided history into periods such as the " Six Ages" or the "Four Empires", and considered their time to be the last before the end of the world. The concept of living in a "middle age" was alien to them, and they referred to themselves as "", or "we modern people". In their concept, their age began when Christ had brought light to mankind, and contrasted the light of their age with the spiritual darkness of previous periods. The Italian humanist and poet Petrarch (d. 1374) was the first to revise the metaphor. He was convinced that a period of decline had begun when emperors of non-Italian origin assumed power in the Roman Empire, and described it as an age of "darkness". His concept was further developed by humanists like Giovanni Boccaccio (d. 1375) and Filippo Villani who emphasized the "rebirth" of culture in their age after a long period of cultural darkness. Leonardo Bruni was the first historian to use tripartite periodisation in his ''History of the Florentine People'' (1442), with a middle period "between the fall of the Roman Empire and the revival of city life sometime in late eleventh and twelfth centuries".Hankins ''Introduction to History of the Florentine people by Leonardo Bruni'' pp. xvii–xviii Tripartite periodisation became standard after the 17th-century German historian Christoph Cellarius divided history into three periods: ancient, medieval, and modern.

The most commonly given starting point for the Middle Ages is around 500, with the date of 476—the year the last Western Roman Emperor was deposed—first used by Bruni. Later starting dates are sometimes used in the outer parts of Europe. For Europe as a whole, 1500 is often considered to be the end of the Middle Ages, but there is no universally agreed upon end date. Depending on the context, events such as the conquest of Constantinople by the Turks in 1453, Christopher Columbus's first voyage to the Americas in 1492, or the Protestant Reformation in 1517 are sometimes used. English historians often use the Battle of Bosworth Field in 1485 to mark the end of the period. For Spain, dates commonly used are the death of King Ferdinand II in 1516, the death of Queen Isabella I of Castile in 1504, or the conquest of Granada in 1492.

Historians from Romance-speaking countries tend to divide the Middle Ages into two parts: an earlier "High" and later "Low" period. English-speaking historians, following their German counterparts, generally subdivide the Middle Ages into three intervals: "Early", "High", and "Late". In the 19th century, the entire Middle Ages were often referred to as the " Dark Ages", but with the adoption of these subdivisions, use of this term was restricted to the Early Middle Ages in the early 20th century.Mommsen "Petrarch's Conception of the 'Dark Ages'" ''Speculum'' p. 226

Later Roman Empire

The Roman Empire reached its greatest territorial extent during the 2nd century AD; the following two centuries witnessed the slow decline of Roman control over its outlying territories. Runaway inflation, external pressure on the frontiers, and outbreaks of plague combined to create the Crisis of the Third Century, with emperors coming to the throne only to be rapidly replaced by new usurpers. Military expenses increased steadily during the 3rd century, mainly in response to the war with the newly established Sasanian Empire.Heather ''Fall of the Roman Empire'' p. 111 The army doubled in size, and cavalry and smaller units replaced the Roman legion as the main tactical unit.Brown ''World of Late Antiquity'' pp. 24–25 The need for revenue led to increased taxes and a decline in numbers of the curial, or landowning, class, and decreasing numbers of them willing to shoulder the burdens of holding office in their native towns. More bureaucrats were needed in the central administration to deal with the needs of the army, which led to complaints from civilians that there were more tax-collectors in the empire than tax-payers.

The Emperor Diocletian (r. 284–305) split the empire into separately administered eastern and western halves in 286. This system, which eventually encompassed two senior and two junior co-emperors (hence known as the Tetrarchy) stabilised the imperial government for about two decades. Diocletian's further reforms strengthened the governmental bureaucracy, reformed taxation, and strengthened the army, which bought the empire time but did not resolve the problems it was facing: excessive taxation, a declining birthrate, and pressures on its frontiers, among others. In 330, after a period of civil war, Constantine the Great (r. 306–337) refounded the city of Byzantium as the newly renamed eastern capital, Constantinople. For much of the 4th century, Roman society stabilised in a new form that differed from the earlier classical period, with a widening gulf between the rich and poor, and a decline in the vitality of the smaller towns. Another change was the Christianisation, or conversion of the empire to Christianity. The process was stimulated by the 3rd-century crisis, accelerated by the conversion of Constantine the Great, and by the end of the century Christianity emerged as the empire's dominant religion. Debates about Christian theology, customs and ethics intensified. Mainstream Christianity developed under imperial patronage, and those who persisted with theological views condemned at the Church leaders' general assemblies known as ecumenical councils had to endure official persecution. Heretic views could survive by popular support, or through intensive proselytizing activities. Examples include the uncompromisingly Monophysite