351 CE
Emperor Constantius II elevates his 25-year-old cousin Constantius Gallus to Caesar at Sirmium (Pannonia). He arranges a marriage with his sister Constantina, and puts him in charge of the Eastern portion of the Roman Empire. The Jewish revolt against Constantius Gallus breaks out. After his arrival at Antioch, the Jews begin a rebellion in Palestine. The Roman garrison in the town of Diocesarea is wiped out. In India, a new process makes possible the extraction of sugar from sugarcane.
Geopolitics & Diplomacy
- Fú Jiàn, an ethnic Di, declares himself "Heavenly Prince" (Tian Wang) during the collapse of Later Zhao, and establishes Former Qin.source
Conflict & Security
- May 7 – The Jewish revolt against Constantius Gallus breaks out. After his arrival at Antioch, the Jews begin a rebellion in Palestine. The Roman garrison in the town of Diocesarea is wiped out.source
- September 28 – Battle of Mursa Major: Constantius II defeats the usurper Magnentius along the valley of the Drava. The battle is one of the bloodiest in Roman military history. During the fighting Marcellinus, a general of Magnentius is killed; Magnentius himself survives.source
- Winter – Magnentius flees to Aquileia in northern Italy and fortifies the mountain passes in the Alps.source
- Constantius II marches West with a large field army (around 60,000 men) to topple Magnus Magnentius in Pannonia.source
Religion & Belief
- Macedonius is restored as Patriarch of Constantinople.source
Science & Discovery
- In India, a new process makes possible the extraction of sugar from sugarcane.source
Crime & Justice
- Emperor Shi Zhi, last ruler of the Later Zhao dynasty, is killed by Ran Min's forces, an action that sets the stage for Wei's victory in the Ran Wei–Later Zhao war.source
Culture & Society
- March 15 – Emperor Constantius II elevates his 25-year-old cousin Constantius Gallus to Caesar at Sirmium (Pannonia). He arranges a marriage with his sister Constantina, and puts him in charge of the Eastern portion of the Roman Empire.source