Historical Context
Paul's episcopate fell during the height of the Arian controversy, when the Nicene and Arian parties contended for the major sees of the empire and emperors took sides. Constantius II, who governed the East, favored the Arians and repeatedly intervened against Paul, while the Western emperors and the bishop of Rome upheld the Nicene cause.
His repeated exiles were bound up with imperial politics as much as doctrine. His election without imperial consultation provoked Constantius II's first reprisal, and the consecration of the rival bishop Macedonius I deepened the conflict, at one point erupting into civic violence that cost the life of the general sent to expel him.