early middle ages midterm

Byzantium

Modern name for the Eastern Roman Empire, centred on Constantinople. Its inhabitants identified as Romans and the empire survived until the Ottoman conquest of Constantinople in 1453.

Middle Ages

Period between antiquity and the early modern period, conventionally c. 500–1500 CE. The Early Middle Ages are usually dated c. 500–1000.

Periodization

The division of history into periods to organise and interpret historical change. Period boundaries are modern conventions and often oversimplify gradual transitions.

Dark Ages

Traditional term for the early medieval period, especially c. 500–1000. It suggests cultural decline but is criticised for overlooking continuity and achievements in early medieval societies.

Edward Gibbon

British historian (1737–1794) who wrote The History of the Decline and Fall of the Roman Empire, published 1776–1788. He attributed Rome’s decline to political, military, and social factors and criticised Christianity’s role.

Late Antiquity

Transitional period, approximately 250–750 CE, characterised by Christianisation, transformations in Roman institutions, the rise of successor kingdoms, Byzantine continuity, and the emergence of Islam.

Roman Empire

Empire established under Augustus in 27 BCE. It developed extensive military, legal, and administrative institutions. Eastern and western courts governed separately after 395 CE. The western imperial office ended in Italy in 476, while the Eastern Roman Empire survived until 1453.

Latin

Language of Roman administration, law, and culture in the western empire. It remained the principal language of the Western Church and eventually developed into the Romance languages.

Greek

Major language of the eastern Mediterranean and Eastern Roman Empire. Koine Greek was important in administration, literature, and Christian theology.

Aramaic

Semitic language widely used in the ancient Near East as an administrative and everyday language. It remained in use in various forms during late antiquity.

Syriac

Literary form of Aramaic used extensively by eastern Christian communities for theology, liturgy, biblical translation, and literature.

Arabic

Semitic language originating in Arabia. Following the rise of Islam in the seventh century, it spread across the Middle East and North Africa and became a major language of government, religion, and scholarship.

Coptic

Final historical stage of the Egyptian language, written mainly using an adapted Greek alphabet. It was used by Egyptian Christians and survives as the liturgical language of the Coptic Orthodox Church.

Sasanians

Persian dynasty that ruled from 224 to 651 CE. The Sasanians promoted Iranian traditions and Zoroastrianism and were major rivals of Rome and Byzantium until the Arab-Muslim conquests.

Relief at Naqsh-e Rostam

Sasanian royal rock carvings near Persepolis. The reliefs of Shapur I commemorate victories over Rome, including the capture of Emperor Valerian in 260 CE, and display Persian imperial power.

Diocletian

Roman emperor from 284 to 305 who reformed taxation, administration, and the army. He introduced the Tetrarchy and initiated the Great Persecution of Christians in 303.

The Tetrarchy

System established by Diocletian around 293 in which two senior emperors, the Augusti, and two junior emperors, the Caesars, shared imperial responsibilities to improve administration and succession.

Galerius

Roman emperor from 305 to 311 and one of Diocletian’s original Tetrarchs. Although he supported Christian persecution, he issued an edict of toleration in 311 shortly before his death.

Diocese

Late Roman administrative unit comprising several provinces and governed by a vicarius. The term later became widely used for an ecclesiastical district under a bishop.

Limitanei and comitatenses

Two categories of late Roman troops. Limitanei were stationed along frontiers, while comitatenses were mobile field armies used to respond to military threats.

The Great Persecution

Persecution of Christians initiated by Diocletian and his colleagues in 303 and ending in stages by 311. Churches and scriptures were targeted and Christians were pressured to sacrifice to traditional gods.

Battle of the Milvian Bridge

Battle in October 312 in which Constantine defeated Maxentius near Rome. Constantine associated his victory with the Christian God, strengthening the connection between imperial authority and Christianity.

Arch of Constantine

Triumphal arch dedicated in Rome in 315 to commemorate Constantine’s victory over Maxentius. It incorporates sculpture from earlier imperial monuments and presents Constantine as a legitimate Roman ruler.

Edict of Milan

Agreement associated with Constantine and Licinius in 313 that granted religious toleration, including to Christians, and provided for the restoration of confiscated Christian property. It did not make Christianity the official state religion.

Constantinople

City dedicated by Constantine in 330 on the site of Byzantium. It became the capital of the Eastern Roman Empire and a major centre of imperial government, trade, and Christianity.

Hippodrome

Chariot-racing arena in Constantinople that served as a centre of public entertainment and political expression. Its racing factions, especially the Blues and Greens, played a role in the Nika Revolt of 532.

Helen (Helena)

Mother of Constantine the Great, c. 246/248–330. She became an influential Christian figure and was associated with pilgrimages and church foundations in the Holy Land.

Donatist Controversy

Dispute that began in North African Christianity around 311 over whether clergy who had compromised during persecution could legitimately administer the sacraments. It created rival church hierarchies and became entangled with imperial enforcement of religious unity.

Council of Nicaea

First ecumenical council, held in 325 under Constantine. It condemned Arius and affirmed that the Son was homoousios, or of the same essence, as the Father.

Constantius II

Roman emperor from 337 to 361 and son of Constantine. He became deeply involved in Christian theological disputes and supported non-Nicene formulations of the relationship between Father and Son.

Julian the Apostate

Roman emperor from 361 to 363 who rejected Christianity and attempted to restore traditional Roman religious practices. His reign was brief and ended during a campaign against the Sasanians.

Valentinian I

Western Roman emperor from 364 to 375 who focused on frontier defence and military security, especially along the Rhine and Danube.

Battle of Adrianople

Battle of 378 in which Gothic forces defeated the Eastern Roman army and killed Emperor Valens. It exposed Roman military weaknesses but did not immediately end the empire.

Theodosius I / Theodosios the Great

Roman emperor from 379 to 395 who promoted Nicene Christianity. The Edict of Thessalonica in 380 established Nicene Christianity as the empire’s official religious norm. His death in 395 was followed by separate eastern and western courts.

Askesis

Greek term meaning exercise or discipline. In Christianity it referred to spiritual practices such as fasting, prayer, celibacy, and renunciation of wealth.

Anthony the Great

Egyptian ascetic, c. 251–356, traditionally regarded as a founder of Christian solitary monasticism. His life, recorded by Athanasius, inspired generations of monks.

Anachoresis / anchorite

Anachoresis means withdrawal from society. An anchorite was a Christian ascetic who lived in relative solitude, often in a desert or isolated cell, to pursue prayer and spiritual discipline.

Pachomius

Egyptian monk, c. 292–348, who helped establish organised communal monasticism. He created communities in which monks lived and worked together under shared regulations.

Cenobitic Monasticism

Form of monasticism in which monks or nuns live communally under a shared rule and superior. Associated especially with Pachomius in fourth-century Egypt.

Monastic Rule

Written regulations governing monastery life, including prayer, work, food, obedience, discipline, and communal relationships.

Lavra

Monastic settlement in which monks occupied separate cells but gathered for communal worship and sometimes shared activities. It combined solitude with community.

Stylite

Christian ascetic who lived on top of a pillar as an extreme religious discipline. Simeon Stylites, c. 390–459, was the most famous early example.

Jerome

Christian scholar, c. 347–420, best known for translating much of the Bible into Latin. His Vulgate became the standard Latin Bible in the Western Church.

Martin of Tours

Christian monk and bishop, c. 316–397, who promoted asceticism and monastic life in Gaul. His charitable reputation made him a major saint in western Europe.

John Cassian

Christian monk and writer, c. 360–435, who transmitted eastern monastic ideas to the Latin West through works including the Institutes and Conferences.

Rule of Benedict

Monastic rule attributed to Benedict of Nursia, composed in the sixth century. It emphasised prayer, work, obedience, stability, and moderation and became influential in western European monasteries.

Arius

Christian presbyter from Alexandria, c. 256–336, who taught that the Son was not co-eternal with the Father. His teachings prompted the Arian controversy and were condemned at Nicaea in 325.

Homoousios

Greek term meaning of the same essence or substance. At Nicaea in 325 it expressed the belief that the Son shares the same divine essence as the Father.

Homoiousios

Greek term meaning of similar essence or substance. It became associated with theological positions distinguishing the Father and Son more than Nicene theology did.

Heresy

Religious teaching judged by an established authority to contradict accepted doctrine. Disputes over heresy in late antiquity were linked to imperial authority, church councils, and political conflict.

Heresiarch

Person regarded by religious opponents as the founder or principal teacher of a heresy, such as Arius.

Athanasius of Alexandria

Bishop of Alexandria, c. 296–373, and leading defender of Nicene Christianity. He opposed Arianism, endured repeated exiles, and promoted asceticism and monasticism.

On the Incarnation

Theological work attributed to Athanasius explaining why the divine Word became human in Christ to overcome sin and death and restore humanity’s relationship with God.

Cappadocian Fathers

Basil of Caesarea, Gregory of Nazianzus, and Gregory of Nyssa, fourth-century theologians who developed Nicene teaching on the Trinity as one divine essence in three persons.

First Council of Constantinople

Ecumenical council held in 381 under Theodosius I. It reaffirmed Nicene Christianity and strengthened the doctrine of the Trinity, including the full divinity of the Holy Spirit.

Theodore of Mopsuestia

Antiochene theologian, c. 350–428, known for biblical interpretation emphasising Christ’s human life and historical context. His legacy became controversial during later disputes about Nestorianism.

Nestorius of Constantinople

Patriarch of Constantinople from 428 to 431 whose teachings on Christ and Mary provoked controversy. He resisted the title Theotokos and was condemned and deposed at Ephesus in 431.

Theotokos

Greek for God-bearer or Mother of God, a title for Mary affirming that the person she bore was God incarnate. The Council of Ephesus upheld the title in 431.

Cyril of Alexandria

Patriarch of Alexandria from 412 to 444 who opposed Nestorius and defended the title Theotokos. He emphasised the unity of Christ’s person and played a central role at Ephesus in 431.

Theodosius II

Eastern Roman emperor from 408 to 450. His reign included the Councils of Ephesus in 431 and 449 and the publication of the Theodosian Code in 438.

Council of Ephesus I

Ecumenical council held in 431 that condemned Nestorius and affirmed Mary as Theotokos. It emphasised the unity of Christ’s person and intensified disputes among Christian theological traditions.

Miaphysite

Christological position asserting that Christ has one united nature of the divine Word, in which divinity and humanity are united without confusion or separation. It is associated with churches that rejected Chalcedon.

Council of Ephesus II

Council of 449 under Theodosius II that reinstated Eutyches and deposed opponents including Flavian of Constantinople. Later opponents called it the Robber Council, and Chalcedon repudiated its decisions in 451.

Council of Chalcedon

Ecumenical council of 451 that defined Christ as one person in two natures, divine and human, without confusion or separation. Its decisions were rejected by many Christians in Egypt and Syria, creating lasting divisions.

Dyophysite

Christological position asserting that Christ exists in two natures, divine and human, united in one person. It is associated with the Definition of Chalcedon in 451.

Jacob Baradaeus

Sixth-century bishop and missionary, c. 500–578, who organised the non-Chalcedonian Syriac Christian hierarchy by ordaining clergy and bishops under imperial pressure.

Melkites

Eastern Christians who accepted Chalcedon and the imperial religious position. The name reflects their association with the emperor’s preferred doctrine and distinguishes them historically from non-Chalcedonian communities.

Monoenergism / Monotheletism

Seventh-century attempts to reconcile Christian divisions. Monoenergism proposed one activity in Christ, while Monotheletism proposed one will. Monotheletism was condemned at Constantinople in 680–681.

Pope Honorius I

Bishop of Rome from 625 to 638 whose letters became associated with Monotheletism. He was posthumously condemned by the Third Council of Constantinople.

Church of the East / East Syrian Church

Christian church that developed in the Sasanian Persian Empire outside the Roman imperial Church. It became a major missionary tradition spreading into Central Asia, India, and China.

Barbarians

Roman term for peoples perceived as outside Roman culture, including Goths, Vandals, Franks, and Huns. The term reflects Roman perspectives and does not describe a single unified people.

Ethnogenesis

Process through which ethnic identities develop and change through migration, political leadership, warfare, and interaction with other groups. Early medieval identities were not fixed or biologically unchanging.

Historical Materialism

Theory associated with Karl Marx and Friedrich Engels that explains historical change through material conditions, economic structures, and relations between social classes.

Mode of Production

Marxist concept describing the combination of productive forces, such as labour and technology, with relations of production, such as ownership and labour relations.

Slave Society

Society in which enslaved labour is central to economic production and social hierarchy. Ancient Rome is frequently described as an example, although slavery’s role varied by period and region.

Coloni

Tenant farmers in the Roman Empire who paid rent or services to landowners. Some became legally tied to estates in late antiquity, although their status varied and they were not simply identical to slaves.

Solidus

Gold coin introduced under Constantine in the early fourth century. Its relative stability supported Roman taxation, military payments, and commerce and it remained influential in Byzantine history.

Late Roman Villa

Large rural estate or elite residence that could combine agricultural production, domestic life, and administration. Villas varied by region and changed as late Roman economic conditions evolved.

Paterfamilias

Male head of a Roman household who held legal authority over descendants under patria potestas. The concept reflected Roman family law and patriarchal social structures.

Melania the Younger

Wealthy Roman aristocratic woman, c. 383–439, who embraced Christian asceticism and gave away much of her fortune to religious and charitable causes. She supported monastic communities, including in Jerusalem.

Huns

Nomadic confederation from the Eurasian steppe that became a major military power in Europe during the fourth and fifth centuries. Under Attila they threatened both Roman empires and contributed to migration and conflict.

Arcadius

Eastern Roman emperor from 395 to 408 and son of Theodosius I. His reign began the period of separate eastern and western imperial courts and was marked by court politics and military pressures.

Honorius

Western Roman emperor from 395 to 423. His reign included the Gothic Sack of Rome in 410 and significant losses of Roman control in the West. His court was based at Ravenna from 402.

Stilicho

Roman general of Vandal ancestry and leading military figure under Honorius. He defended Italy against Gothic threats but was executed in 408 amid court rivalries, weakening western imperial defence.

Visigoths

Gothic people who sacked Rome in 410 under Alaric and later established a kingdom in southwestern Gaul and Iberia. They became one of the major successor states to Rome.

Foederati / foedus

Foederati were peoples or military groups bound to Rome by treaty, or foedus, in exchange for military service and benefits such as supplies or settlement rights. These arrangements varied across the late Roman Empire.

Alaric

King of the Visigoths who led campaigns against Rome and sacked the city in 410. He sought recognition and favourable settlement terms for his people and died shortly after the sack.

Gothic Sack of Rome

Capture and plundering of Rome by Alaric’s Visigoths in August 410. It shocked the Roman world and symbolised weakening western imperial power, although Rome retained cultural and religious importance.

Valentinian III

Western Roman emperor from 425 to 455 whose reign saw increasing fragmentation. His general Aetius managed many military threats before Valentinian assassinated him in 454.

Geiseric

King of the Vandals from 428 to 477 who led them into North Africa, captured Carthage in 439, and established a powerful Mediterranean kingdom. He also led the Sack of Rome in 455.

Aetius

Roman general, c. 391–454, who served Valentinian III and relied on alliances with groups beyond the empire. He helped oppose Attila’s invasion of Gaul in 451 and was assassinated in 454.

Attila

King of the Huns who ruled from 434 to 453. He campaigned against both Roman empires, invaded Gaul in 451 and Italy in 452, and extracted tribute before his confederation fragmented after his death.

Vandal Conquest of Carthage

Capture of Carthage by Geiseric in 439. The loss of this wealthy North African centre deprived the Western Roman government of significant revenue and an important agricultural supply base.

Petronius Maximus

Western Roman emperor in 455 whose brief reign followed Valentinian III’s assassination. During a crisis, Geiseric invaded Italy and sacked Rome, and Petronius was killed while attempting to flee.

Vandal Sack of Rome

Sack of Rome by Geiseric’s Vandals in 455. The Vandals took valuable goods and captives, including members of the imperial family, further weakening western imperial authority.

Odoacer

Military leader who deposed Romulus Augustulus in 476 and ruled Italy. He acknowledged the Eastern Roman emperor while governing independently and is conventionally associated with the end of the Western Roman Empire.

Romulus Augustulus

Last Western Roman emperor to rule in Italy, installed in 475 and deposed by Odoacer in 476. Julius Nepos nevertheless continued to claim the imperial title until 480.

Parthians

Rulers and peoples of the Parthian Empire, c. 247 BCE–224 CE. They controlled much of Iran and Mesopotamia and were major rivals of Rome before being replaced by the Sasanians.

Seleucia-Ctesiphon

Two major cities on the Tigris near modern Baghdad that together formed a political and urban centre of the Parthian and Sasanian empires.

Shapur I

Sasanian king, c. 240–270, who fought major wars against Rome and captured Emperor Valerian in 260. His victories were celebrated in royal inscriptions and monumental reliefs.