Itineraries of the Roman emperors, 337–363

It does not cover the imperial usurpers of the period, including Magnentius, Vetranio, Claudius Silvanus, and Poemenius.

After an interregnum of three months, during or after which the army and its agents lynched other potential successors, the three sons of Constantine declared themselves Augusti on 9 September 337.

[4][notes 1] Constantine II ruled the provinces of Gaul, Britain, Spain, and Germany from Trier.

[9] In 340, Constantinus attempted to seize his brother Constans' territory, and was killed while reconnoitering Ravenna during the ensuing civil war.

Magnentius was defeated and killed in the summer of 353 at the Battle of Mons Seleucus, making Constantius the sole emperor.

[12] Constantius appointed Gallus Caesar (subordinate emperor) on 15 March 351, and delegated the rule of the eastern provinces to him.

[13] To address Persian influence and aggression on the eastern frontier, Constantius ruled from Antioch from 360 until his death.

A superscript S indicates that the manuscript is corrupt, and has been emended to follow Otto Seeck's corrections in his edition of the Codex Theodosianus.