Europe · Antiquity and the Roman world
Gallic Empire
260–274
The Gallic Empire (a modern historiographical term) was a breakaway western portion of the Roman Empire that functioned de facto as a separate state from 260 to 274, during the Crisis of the Third Century. It comprised Gaul, Britain, and (initially) Hispania and the Germanies, with capitals at Colonia Agrippina (Cologne) and later Augusta Treverorum (Trier).
- Existed
- 260–274
- Shown on the map
- AD 261–282
- Peak area
- 715k km²
- Region
- Europe
Overview
The Gallic Empire (a modern historiographical term) was a breakaway western portion of the Roman Empire that functioned de facto as a separate state from 260 to 274, during the Crisis of the Third Century. It comprised Gaul, Britain, and (initially) Hispania and the Germanies, with capitals at Colonia Agrippina (Cologne) and later Augusta Treverorum (Trier).
History
It was founded by Postumus (r. 260–269), a respected general on the Rhine, after Emperor Valerian's capture by the Sasanians left Gaul undefended; Postumus killed Gallienus's son Saloninus at Cologne and declared himself emperor. He notably refused to march on Rome, instead concentrating on defending the Rhine frontier — and even declined to fight Gallienus in single combat. He maintained a full Roman-style state, with consuls, a senate, and his own coinage. After his murder came the ephemeral Marius (269), then Victorinus (269–271), assassinated by a jealous husband, and finally Tetricus I (271–274), governor of Aquitania, elevated with the support of Victorinus's mother Victoria; Tetricus made his son Tetricus II caesar in 273.
Decline and legacy
Emperor Aurelian, having crushed the Palmyrene Empire in the east, invaded Gaul and defeated Tetricus at the Battle of Châlons (also called the First Battle of the Catalaunian Plains) in 273 or 274. Whether Tetricus's surrender resulted from military defeat or a secret prior arrangement with Aurelian is debated. Aurelian spared Tetricus, making him a senator and corrector in Italy. The reconquest reunified the Roman world but left the Rhine frontier weakened. The sources (chiefly the unreliable Historia Augusta, plus coins) make much of this history uncertain.
Common questions
- What was the Gallic Empire?
- The Gallic Empire (a modern historiographical term) was a breakaway western portion of the Roman Empire that functioned de facto as a separate state from 260 to 274, during the Crisis of the Third Century. It comprised Gaul, Britain, and (initially) Hispania and the Germanies, with capitals at Colonia Agrippina (Cologne) and later Augusta Treverorum (Trier).
- When did the Gallic Empire exist?
- The Gallic Empire existed 260–274. On this map it is drawn AD 261–282.
- How large was the Gallic Empire?
- At its greatest extent drawn on this map, the Gallic Empire covered about 715,000 km². That is the largest area the border data gives it across the years it is drawn, not necessarily its greatest extent in history.
- Who ruled the Gallic Empire?
- It was founded by Postumus (r. 260–269), a respected general on the Rhine, after Emperor Valerian's capture by the Sasanians left Gaul undefended; Postumus killed Gallienus's son Saloninus at Cologne and declared himself emperor. He notably refused to march on Rome, instead concentrating on defending the Rhine frontier — and even declined to fight Gallienus in single combat.
- How did the Gallic Empire end?
- Emperor Aurelian, having crushed the Palmyrene Empire in the east, invaded Gaul and defeated Tetricus at the Battle of Châlons (also called the First Battle of the Catalaunian Plains) in 273 or 274. Whether Tetricus's surrender resulted from military defeat or a secret prior arrangement with Aurelian is debated.
Sources
This compendium cites its sources once for the whole document rather than per territory. Its bibliography names the English Wikipedia articles for each territory and its key figures as the primary basis, with Encyclopædia Britannica, the World History Encyclopedia, and academic and primary sources — Jordanes, Procopius, Gregory of Tours, Bede, Ammianus and the Anglo-Saxon Chronicle, read through the secondary literature. The article this entry is anchored on:
- Wikipedia — Gallic Empire en.wikipedia.org/wiki/Gallic_Empire
This entry was last updated .
This entry was researched and drafted with AI from the sources above, and has not been reviewed by a historian. How entries are made
Text available under CC BY-SA 4.0: reuse it with a credit to The World Through Time and a link to this page. Passages drawing on the Wikipedia articles listed above are also licensed CC BY-SA 4.0 by their contributors.
Border geometry for the map itself comes from Cliopatria v0.12 (Seshat Global History Databank, CC-BY-4.0).
See the Gallic Empire in its world
Open the atlas at AD 272 and every neighbour, rival and successor is on screen with it — then drag the slider and watch what happens next.
Open the map at AD 272 →