Julius Constantius

Flavius Julius Constantius (died 337) was a son of Emperor Constantius Chlorus and Flavia Maximiana Theodora, and a younger half-brother of Constantine the Great. Long kept away from court, he was summoned to Constantinople only after the empress Helena's death, and in 335 Constantine made him patricius and consul.

By his second wife Basilina he fathered the future emperor Julian, while an earlier son, Gallus, became Caesar under Constantius II. In the purges that followed Constantine's death in 337, Julius Constantius and his eldest son were executed on Constantius II's orders.