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His father, Constantius, was a member of an important Roman family. His mother, Helena, was the daughter of an innkeeper. In 293 the emperor Diocletian made Constantius caesar, or emperor, of Gaul and Britain. Young Constantine was kept at the court of Galerius, the Eastern emperor, virtually as a hostage. He escaped in 305 and joined his father. Constantius died the next year, and the army hailed Constantine as caesar.
Of Constantine's sons the eldest, Constantine II, showed decided leanings to heathenism, and his coins bear many pagan emblems; the second and favourite son, Constantius, was a more pronounced Christian, but it was Arian Christianity to which he adhered.