Julian’s Winter Encampment at Sens and the …
Years: 356 - 356
Julian’s Winter Encampment at Sens and the Alamanni Siege (356/357 CE)
During his Gallic campaigns, Julian, Caesar of the West, chose Senones (modern Sens, France) near Paris as his winter base for 356/357 CE. To spread the burden of quartering his army, he stationed most of his troops in different towns, with the main force at Reims under the command of Marcellus.
However, this decision left Julian vulnerable, and when the Alamanni learned of his reduced escort, they launched a siege against Sens, forcing Julian into a month-long defensive struggle.
1. The Siege of Sens (356 CE)
- A large Alamannic force surrounded Sens, trapping Julian inside the city with only a small contingent of troops.
- The Romans successfully held out for about a month, resisting repeated assaults.
- However, Julian was too heavily outnumbered to sally forth or pursue the Alamanni when they finally withdrew.
2. The Failure of Marcellus to Assist Julian
- While besieged, Julian expected reinforcements from his commander at Reims, Marcellus, the magister equitum (Master of Horse).
- Marcellus failed to send aid, despite having a substantial force at his disposal.
- Ammianus Marcellinus, a contemporary historian, condemned Marcellus' inaction as cowardice, highlighting his failure to support Julian during a critical moment.
3. Marcellus is Dismissed and Replaced by Severus
- Upon hearing of Marcellus' failure, Emperor Constantius II dismissed him as magister equitum, replacing him with Severus, a trusted and experienced officer.
- Severus was known for being more compatible with Julian, strengthening command cohesion.
4. Consequences and Significance of the Event
- The successful defense of Sens further boosted Julian’s reputation as a capable and resilient leader.
- Marcellus' dismissal demonstrated Constantius' confidence in Julian, despite growing tensions between the two rulers.
- The incident exposed weaknesses in Roman command coordination, highlighting the challenges of defending the empire from Germanic incursions.
Though the siege of Sens was a defensive victory, it foreshadowed Julian’s growing autonomy and eventual break with Constantius, leading to his rise as sole emperor in 361 CE.
Locations
People
Groups
- Franks
- Gallia Lugdunensis (Roman province)
- Germans
- Alamanni (Germanic tribal alliance)
- Gaul, Diocese of
- Roman Empire: Constantinian dynasty (Constantinople)
Topics
- Roman Age Optimum
- Late Antiquity
- Migration Period
- Durocortorum, Battle of
- Brumath, Battle of
- Senonae, Siege of
- Autun, Siege of
