4th century Constantius Chlorus returned in 306, despite his poor health, aiming to invade northern Britain, with the provincial defences having been rebuilt in the preceding years. Source: Internet
3. Tetrarchy until 16 May 307 After the death of Constantius his legions proclamate his son Constantin to be the new Augustus, but Galerius elevates Severus to be the new junior Augustus and compensates Constantin with the grade of ''Caesar'. Source: Internet
According to Theodoret, (HE 2.23), Acacius informed the emperor that one of the things sold by Cyril was a 'holy robe' dedicated by Constantine himself, which consequently turned Constantius against Cyril. Source: Internet
A. H. M. Jones, "The Later Roman Empire" (Baltimore, 1986), pg. 114 This action aggravated Constantius II, who was a committed supporter of Arianism. Source: Internet
After the defeat and death of Magnentius in the Battle of Mons Seleucus in 353, Constantius II dispatched his chief imperial notary Paulus Catena to Britain to hunt down Magnentius's supporters. Source: Internet
After achieving his aims, Constantius advanced on Magnentius in Italy. Source: Internet