factbase-ancient-history/battles/battle-of-adrianople.md

Battle of Adrianople

Overview

The Battle of Adrianople (9 August 378 CE) was a catastrophic Roman defeat in which a Gothic coalition destroyed a Roman army and killed Emperor Valens. @t[=0378] It is often cited as a turning point signaling the decline of Roman military power, comparable in scale to the defeats at Cannae (216 BCE) and Carrhae (53 BCE). ¹

Key Facts

• Date: 9 August 378 CE @t[=0378]
• Location: Adrianople (modern Edirne, Turkey), Roman province of Thracia
• Belligerents: Eastern Roman Empire vs. Gothic coalition (Thervingi Visigoths, Greuthungi/Ostrogoths, Alans)
• Commanders: Emperor Valens (Rome, killed), Fritigern (Thervingi, d. c. 380 CE)
• Result: Decisive Gothic victory ²
• Roman losses: Approximately two-thirds of the army (~10,000–20,000 killed), including Valens ^{2 3}

Background

The battle was the culmination of the Gothic War (376–382 CE). @t[0376..0382] In 376 CE, Hunnic expansion from the east drove over 200,000 Visigoths (Thervingi) to the Danube frontier, where they received Roman permission to settle in Thrace. @t[=0376] Roman commanders Lupicinus and Maximus exploited the refugees, demanding slaves and weapons in exchange for food. Facing starvation, the Goths revolted under Fritigern. Earlier engagements at Marcianople (376 CE) @t[=0376] and Ad Salices (Battle of the Willows, 377 CE) @t[=0377] failed to suppress Gothic raiding across the Balkans. ¹

By 378 CE, Valens — who had been campaigning against Persia — returned to Constantinople under pressure from its citizens and marched against Fritigern. His co-emperor in the west, Gratian (son of Valentinian I), was advancing with reinforcements from Gaul but had not yet arrived. ²

The Battle

• Valens attacked without waiting for Gratian's western reinforcements, reportedly driven by jealousy of his nephew's military successes ^{2 1}
• Fritigern sent peace envoys on the morning of battle — historians regard this as a stalling tactic to await the return of ~10,000 Greuthungi cavalry who were away foraging ^{2 1}
• Roman cavalry on the left flank was routed when the Greuthungi arrived and struck unexpectedly
• Roman infantry, already exhausted from an eight-mile march in August heat without food or water, was surrounded and annihilated ²
• Valens was mortally wounded; his body was never recovered ²

Significance

• Demonstrated the vulnerability of Roman legions to heavy cavalry and the dangers of poor scouting and low morale ^{3 1}
• The Goths lacked siege equipment and could not take Adrianople itself; the Gothic War continued until 382 CE ¹
• Led to the Treaty of 382 CE: Emperor Theodosius I settled the Goths within the empire as foederati, granting land in exchange for military service @t[=0382] ^{3 4}
• Alaric, a Visigoth and former Roman commander, sacked Rome in 410 CE — a downstream consequence of the foederati settlement @t[=0410] ¹
• Often considered a harbinger of the fall of the Western Roman Empire (476 CE) ^{3 4}

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1. Wasson, Donald L. "Battle of Adrianople." World History Encyclopedia, 2014. https://www.worldhistory.org/Battle_of_Adrianople/ ↩︎

2. Ammianus Marcellinus, Res Gestae 31.12–13 (~390 CE) ↩︎

3. Burns, T.S. Barbarians Within the Gates of Rome. Indiana University Press, 1994. ↩︎

4. Heather, Peter. The Fall of the Roman Empire: A New History of Rome and the Barbarians. Oxford University Press, 2006. ↩︎