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Constantine II
Emperor of the Roman Empire
Constantine II as Caesar
Reign	1 March 317 - 337 (as Caesar in the west under his father); 337 - 340 (joint emperor with Constantius II and Constans, over Gaul, Hispania, and Britannia, in 340 in failed competition with Constans);
Full name	Flavius Claudius Constantinus
Born	316
	Arles
Died	340
	Aquileia
Predecessor	Constantine I
Successor	Constantius II and Constans
Dynasty	Constantinian
Father	Constantine I
Mother	Fausta

Flavius Claudius Constantinus, known in English as Constantine II, (316 – 340) was Roman Emperor from 337 to 340. The eldest son of Constantine I and Fausta, he was born at Arles, and was raised as a Christian.

On March 1, 317, Constantine was made Caesar, and at the age of seven, in 323, took part in his father's campaign against the Sarmatians. At the age of ten he became commander of Gaul, after the death of his half-brother Crispus. An inscription dating to 330 records the title of Alamannicus, so it is probable that his generals won a victory over Alamanni. His military career continued when Constantine I elected his son field commander during the 332 campaign against the Goths.

Following the death of his father in 337, Constantine II became emperor jointly with his brothers Constantius II and Constans. After the division of the empire, made by the three brothers in September of the same year in Pannonia, he ruled over Gaul, Britannia and Hispania.

He was involved in the struggle between the different Christian streams. The Western portion of the empire leaned towards Trinitarism and against Arianism, and Constantine freed Athanasius and allowed him to return to Alexandria. This action also put some burden on Constantius II, who was a supporter of Arianism.

At first, he was the guardian of his younger brother Constans, whose portion was Italia, Africa and Illyricum. As Constans came of age, Constantine would not relinquish the guardianship and in 340 he marched against Constans in Italy, but was defeated at Aquileia and died in battle. Constans came to control his deceased brother's realm.

• Media related to Constantine II (emperor) from the Wikimedia Commons.
• DiMaio, Michael, and Robert Frakes, "Constantine II (337-340 A.D.)", D.I.R.