Constans I

Constans I (c. 323–350), youngest son of Constantine the Great and Fausta, was made caesar in 333 and became augustus in 337, receiving Italy, Illyricum and Africa. In 340 his troops ambushed and killed the invading Constantine II near Aquileia, seizing Gaul, Spain and Britain.

He later quarrelled with his surviving brother Constantius II over the exiled bishop Athanasius. He campaigned against the Franks in 341–342 and crossed to Britain in 343, the last legitimate emperor to visit it for a millennium. In January 350 the general Magnentius was proclaimed emperor at Autun; Constans fled toward the Pyrenees and was hunted down and killed.