The conflict between Arianism and Trinitarian beliefs was the first major doctrinal confrontation in the Church after the legalization of Christianity by the Roman Emperors Constantine I and Licinius.

Stability emerged after the defeat of Licinius by Constantine in 324.

* 313 – The Edict of Milan, signed by Constantine the Great and co-emperor Valerius Licinius granting religious freedom throughout the Roman Empire, is posted in Nicomedia.

* 324 – Battle of Adrianople: Constantine I defeats Licinius, who flees to Byzantium.

* 317 – Crispus and Constantine II, sons of Roman Emperor Constantine I, and Licinius Iunior, son of Emperor Licinius, are made Caesares

* 314 – Roman Emperor Licinius is defeated by his colleague Constantine I at the Battle of Cibalae, and loses his European territories.

A crisis precipitated by the rejection of religious freedom by Licinius, Emperor of the Eastern Roman Empire, in favor of paganism resulted in a civil war in 324 that placed Constantine firmly in control of a reunited Empire.

Early in 313, Constantine and fellow Emperor Licinius reached an agreement at Milan that they would grant freedom of religion to the Christians and other religions and restore church property.

* 324 – Constantine the Great decisively defeats Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire.

This Tetrarchy lasted until c. 313, when internecine conflict eliminated most of the claimants to power, leaving Constantine in the West and Licinius in the East.

The council agreed that Licinius would become Augustus in the West, with Constantine as his Caesar.

This agreement proved disastrous: by 308 Maxentius had become de facto ruler of Italy and Africa even without any imperial rank, and neither Constantine nor Maximinus — who had both been Caesares since 306 and 305 respectively — were prepared to tolerate the promotion of the Augustus Licinius as their superior.

By 313, therefore, there remained only two emperors: Constantine in the West and Licinius in the East.

The Tetrarchic system was at an end, although it took until 324 for Constantine to finally defeat Licinius, reunite the two halves of the Roman Empire and declare himself sole Augustus.

* Licinius is in Thessalonica executed on charge of conspiring, and raising troops against Constantine I.

* Constantine I forged co-emperor Licinius to a alliance, and offers him his halfsister Constantia in marriage.

* July 3 – Battle of Adrianople: Emperor Constantine the Great defeats his rival Licinius near Adrianople, forcing him to retreat to Byzantium.

* July – Battle of Hellespont: Crispus, destroys Licinius ' naval fleet in the Dardanelles, allowing his father Constantine the ability to cross over the Bosporus into Asian provinces.

* September 18 – Battle of Chrysopolis: Constantine I definitively defeats Licinius at Chrysopolis, and becomes sole Emperor, thus ending the period of the Tetrarchy.

* February 3 – Edict of Milan: Constantine the Great and co-emperor Licinius met at a conference in Mediolanum ( modern Milan ).

* Constantine I and Licinius accept Christianity, they agree on a policy of religious toleration.

Here Constantine I and Licinius issued the Edict of Milan.

* Isaac I Comnenus resigns as Byzantine Emperor, appointing Constantine Ducas as his successor.

However, he later asked his brother and successor Constantine VIII to be buried in the Church of St. John the Theologian ( i. e. the Evangelist ), at the Hebdomon Palace complex, outside the walls of Constantinople.

After Constans ' son and successor, Constantine IV had overcome the Muslim siege of Constantinople in 678, he immediately set his sights on restoring communion with Rome: he wrote to Pope Donus suggesting a conference on the matter.

After Constantine the Great had enlarged Byzantium to make it into a new capital city in 330, it was thought appropriate that its bishop, once a suffragan of Heraclea Pontica and traditionally a successor of Saint Andrew the Apostle, should become second only to the Bishop of Old Rome.

This situation was exploited by the courtiers, led by Michael Psellos, who influenced Isaac to appoint as his successor Constantine Doukas, to the exclusion of his own brother John Komnenos.

John VIII Palaiologos named his brother Constantine XI, who had served as regent in Constantinople in 1437 – 1439, as his successor.

As he was dying, Constantius recommended his son to the army as his successor ; consequently Constantine was declared emperor by the legions at York.

In April 307, he attempted to depose his son, but failed and fled to the court of Constantius ' successor, Constantine ( who was both Maximian's step-grandson and also his son-in-law ), in Trier.

Geoffrey states that Vortigern was the successor to Constans, the son of the usurping emperor Constantine III.

Arthur's successor, Constantine III of Britain, has to deal with the remainder of Mordred's army, led by his two sons.

In Geoffrey, Arthur's successor Constantine tracks them down and kills them in their sanctuaries ; in the Lancelot-Grail, the elder son, Melehan, is killed by Bors, while Lancelot slays his brother.

This was not only the name of his maternal grandfather, Grand Duke Konstantin Romanov of Russia, but also the name of the " King who would reconquer Constantinople ", the future " Constantine XII, legitimate successor to the Emperor Constantine XI Palaiologos ", according to popular legend.

In spite of this tacit opposition, Constantine was chosen as successor by the ailing Isaac in November, 1059, under the influence of Michael Psellos.

This was no doubt suggested by the Donation of Constantine, but it now came to be used only at the coronation of Popes, starting with Gregory XI in 1370 and his successor Urban VI in 1378.

He wrote in direct response to the Byzantine iconoclasm that began in the eighth century by the Byzantine emperor Leo III and continued by his successor Constantine V. St. John maintains that depicting the invisible God is indeed wrong, but he argues that the incarnation, where " the Word became flesh " ( John 1: 14 ), indicates that the invisible God became visible, and as a result it is permissible to depict Jesus Christ.

Constantine was born in Constantinople, the son and successor of Emperor Leo III and Maria.

Kormisosh of Bulgaria raided as far as the Anastasian Wall, but was defeated in battle by Constantine V, who inaugurated a long series of nine successful campaigns against the Bulgarians in the next year, scoring a victory over Kormisosh's successor Vinekh at Marcelae.

By this time, the Greek cities were in practice subject to the Roman Empire ' Cythera continued to exist under the Roman Empire and its Byzantine successor state for centuries ; Christianity is attested from the fourth century AD, the time of Constantine ; according to her legend, Saint Elessa came from Laconia to convert the island.

Arthur's successor is appointed ( Constantine, son of King Carados of Scotland ), and the realm that Arthur created is significantly changed.

Later he had disagreements with his successor as leader, Constantine Mitsotakis, and sat for a time as an independent MP.

Under the command of Constantine, and his successor in 1898, the more famous Sam Steele, the NWMP distinguished itself during the Klondike Gold Rush, which started in 1896, making it one of the most peaceful and orderly such affairs in history.

The throne does not belong to me ; it belongs to my august father King Constantine, and, constitutionally, my eldest brother is his successor.

Much later, Geoffrey of Monmouth included the figure in his pseudohistorical chronicle Historia Regum Britanniae, adding fictional details to Gildas ' account and making Constantine the successor to King Arthur as King of Britain.

His son Constantine was instantly proclaimed as successor by the troops based in the fortress.