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Constantius II

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Constantius II was a Roman emperor who ruled from 337 to 361.

He was the third son of Constantine the Great. His father elevated him to the rank of Caesar in 324. This means he was a junior emperor. When Constantine died in 337, Constantius became an Augustus. An Augustus was a senior emperor with full power. He shared this power with his brothers, Constantine II and Constans.

Impero Romano da maggio a settembre 337
Impero Romano da maggio a settembre 337

This period was defined by constant warfare and internal political struggles. His reign shaped how the Roman Empire managed its borders and its religion.

Upon his father's death, the empire was divided among the three brothers. Constantius received the eastern provinces. These included Greece, Thrace, Asia Minor, Syria, and Egypt.

Miliarensis of Constantius II, AD 327
Miliarensis of Constantius II, AD 327

His brother Constantine II took control of the west. This included Britannia, Gaul, Hispania, and Mauretania. The third brother, Constans, ruled Italy, Africa, and parts of the Balkans. This division was meant to manage the massive territory. However, it often led to tension and conflict between the rulers.

Constantius spent much of his time defending the eastern frontier. He faced the Sasanian Empire under King Shapur II. The Sasanians launched attacks into Roman Mesopotamia. They used large armies and even war elephants.

The triumph of Constantius II
The triumph of Constantius II

Constantius fought to protect major fortresses like Nisibis, Singara, and Amida. In 336, he defeated the Persian general Narses at the battle of Narasara. To strengthen his defenses, Constantius refortified the city of Amida. He built larger circuit walls and new towers there. He also constructed a new stronghold called Antinopolis in the nearby area.

Internal politics were often as dangerous as foreign wars. Shortly after Constantine died, the army killed several of Constantius's relatives. This included two uncles and seven cousins. While the official report blamed a mutinous army, many historians blamed Constantius. In 350, the western ruler Constans was assassinated by a usurper named Magnentius. A usurper is someone who seizes power without a legal right. Constantius had to fight a civil war to reclaim the empire. He won a massive battle at Mursa Major in 351.

Double Centenionalis Magnentius-XR-s4017
Double Centenionalis Magnentius-XR-s4017

He won again at Mons Seleucus in 353. After Magnentius committed suicide, Constantius became the sole ruler.

Constantius also managed his family members as political leaders. In 351, he made his cousin Constantius Gallus a Caesar. He even married his sister, Constantina, to Gallus to ensure loyalty. However, Constantius received reports of Gallus being violent and corrupt.

Solidus-Constantius Gallus-thessalonica RIC 149
Solidus-Constantius Gallus-thessalonica RIC 149

Consequently, Constantius had Gallus arrested and executed in 354. Later, in 355, he promoted his other cousin, Julian, to the rank of Caesar. This move was intended to stabilize the leadership of the empire.

Religious policy was another major part of his rule. Constantius promoted Arianism, which was a specific Christian belief. He also banned traditional pagan sacrifices. He issued laws that targeted Jewish people as well. These religious decisions caused deep conflicts within Roman society. These tensions continued even after his reign ended. His policies showed how an emperor could use religion to influence the state.

In his final years, Constantius faced new threats. He fought the Alamanni tribes on the Danube frontier. He also campaigned against the Quadi and Sarmatians.

2009 Carnuntum Heidentor1
2009 Carnuntum Heidentor1

In 360, the war with the Sasanians became intense again. Constantius traveled east to restore order after losing border fortresses. During this time, his cousin Julian claimed the rank of Augustus. This led to a standoff between the two relatives. Constantius became ill with a fever in 360. He died in Mopsuestia on 3 November 361. It is said he named Julian as his successor before he died.

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🖼️ Images & Media (14)
File:Miliarensis of Constantius II, AD 327.jpg
Miliarensis of Constantius II, AD 327.jpg
File:Bust_of_Prince_Constantius_II_in_blue_glass,_Romisch-Germanisches_Museum,_Cologne_(8115676712).jpg
Bust_of_Prince_Constantius_II_in_blue_glas...
File:Impero_Romano_da_maggio_a_settembre_337.png
Impero_Romano_da_maggio_a_settembre_337.png
File:Colossal Portrait or Constantius II or Constans.jpg
Colossal Portrait or Constantius II or...
File:Double Centenionalis Magnentius-XR-s4017.jpg
Double Centenionalis Magnentius-XR-s4017.jpg
File:Solidus-Constantius Gallus-thessalonica RIC 149.jpg
Solidus-Constantius Gallus-thessalonica...
File:Constantius2cng10400876.jpg
Constantius2cng10400876.jpg
File:07 constantius2Chrono354.png
07 constantius2Chrono354.png
File:Byzantine - Belt Section with Medallions of Constantius II and Faustina - Walters 57527 - Back.jpg
Byzantine - Belt Section with Medallions...
File:Nerazio Cereale - base di statua nel Foro Romano.jpg
Nerazio Cereale - base di statua nel Foro...
File:2009 Carnuntum Heidentor1.jpg
2009 Carnuntum Heidentor1.jpg
File:The triumph of Constantius II.jpg
The triumph of Constantius II.jpg

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