Roman Era - 307-361 AD - Emperors
 
Maximian (Latin: Marcus Aurelius Valerius Maximianus; c. 250 – c. July 310), nicknamed Herculius, was Roman emperor from 286 to 305. He was Caesar from 285 to 286, then Augustus from 286 to 305. He shared the latter title with his co-emperor and superior, Diocletian, whose political brain complemented Maximian's military brawn. Maximian established his residence at Trier but spent most of his time on campaign. In late 285, he suppressed rebels in Gaul known as the Bagaudae. From 285 to 288, he fought against Germanic tribes along the Rhine frontier. Together with Diocletian, he launched a scorched earth campaign deep into Alamannic territory in 288, refortifying the frontier.
 
Galerius Valerius Maximinus, born as Daza[i] (Ancient Greek: Μαξιμίνος; 20 November c. 270 – c. July 313), was Roman emperor from 310 to 313. In 305 his uncle Galerius admitted him to the Tetrarchy with the rank of caesar, a controversial appointment which helped start the civil wars of the Tetrarchy in the following year. Maximinus Daza claimed the title of augustus in 310, sharing and often contesting power with Licinius. A committed pagan, he engaged in one of the last persecutions of Christians, and was the last person to hold the title of Pharaoh of Egypt. In 313 Maximinus Daza openly turned against Licinius and was routed at the Battle of Tzirallum. He died during the subsequent retreat, shortly after publishing an edict of tolerance restoring the Christians' freedoms
 
Valerius Licinianus Licinius (/lɪˈsɪniəs/;[4] Greek: Λικίνιος; c. 265 – 325) was Roman emperor from 308 to 324. For most of his reign, he was the colleague and rival of Constantine I, with whom he co-authored the Edict of Milan that granted official toleration to Christians in the Roman Empire. He was finally defeated at the Battle of Chrysopolis (AD 324), and was later executed on the orders of Constantine.
 
Constantine I[g] (27 February 272 – 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity.[h] He played a pivotal role in elevating the status of Christianity in Rome, the Edict of Milan decriminalising Christian practice and ceasing Christian persecution. This was a turning point in the Christianisation of the Roman Empire. He founded the city of Constantinople (now Istanbul) and made it the capital of the Empire, which it remained for over a millennium.
 
Constantine II (316–340 AD) was a Roman emperor who ruled from 337 to 340, known for his military campaigns and the division of the Roman Empire among his brothers.
 
Flavius Julius Constans (c. 323 – 350), also called Constans I, was Roman emperor from 337 to 350. He held the imperial rank of caesar from 333, and was the youngest son of Constantine the Great.
 
Constantius II - 337-361 AD
On the death of Constans I in the west, a number of individuals rose up to claim their place as emperor. Both Nepotianus and Vetranio did not last the year however, whilst Magnentius managed to secure his rule over the western half of the empire, with Constantius II still ruling over the east.
Constantius who had been busy forwarding the policies of his father, Constantine the Great, knew he eventually had to confront the usurper Magnentius. In 353 AD the decisive battle came at Mons Seleucus where Magnentius was badly defeated, prompting his subsequent suicide.
Constantius continued to rule past the brief reigns of these usurpers but eventually died during the rebellion of the next usurper Julian.
READ MORE: Magnentius