* 681 – Bulgaria is founded as a Khanate on the south bank of the Danube after defeating the Byzantine armies of Emperor Constantine IV south of the Danube delta.

Schweitzer concludes that the 1st century theology, originating in the lifetimes of those who first followed Jesus, is both incompatible with, and far removed from, those beliefs later made official by the Roman Emperor Constantine in 325 CE.

Constantine is believed to have exiled those who refused to accept the Nicean creed — Arius himself, the deacon Euzoios, and the Libyan bishops Theonas of Marmarica and Secundus of Ptolemais — and also the bishops who signed the creed but refused to join in condemnation of Arius, Eusebius of Nicomedia and Theognis of Nicaea.

Nicaea was convoked by Constantine I in May – August 325 to address the Arian position that Jesus of Nazareth is of a distinct substance from the Father.

According to the work De Administrando Imperio written by the 10th-century Byzantine Emperor Constantine VII, the Croats had arrived in what is today Croatia in the early 7th century, however that claim is disputed and competing hypotheses date the event between the 6th and the 9th centuries.

According to the Constantine VII christianization of Croats began in the 7th century, but the claim is disputed and generally christianization is associated with the 9th century.

He is often known as Constantine I, in reference to his place in modern lists of kings of Scots, though contemporary sources described Causantín only as a Pictish king.

It is likely that Causantín's ( Constantine I ) reign witnessed increased activity by Vikings, based in Ireland, in Northumbria and in northern Britain.

The same style is used of Kenneth's brother Donald I ( Domnall mac Ailpín ) and sons Constantine I ( Constantín mac Cináeda ) and Áed ( Áed mac Cináeda ).

Although the date of his birth is nowhere recorded, Constantine II cannot have been born any later than the year after his father's death, that is 879.

The Second Battle of Corbridge appears to have been indecisive ; the Chronicle of the Kings of Alba is alone in giving Constantine the victory.

A meeting at Eamont Bridge on 927 was sealed by an agreement that Constantine, Owen of Strathclyde, Hywel Dda, and Ealdred would " renounce all idolatry ": that is, they would not ally with the Viking kings.

Following his disappearance from Æthelstan's court after 935, there is no further report of Constantine until 937.

In this the " hoary " Constantine, by now around 60 years of age, is said to have lost a son in the battle, a claim which the Chronicle of the Kings of Alba confirms.

The monastery which Constantine retired to, and where he is said to have been abbot, was probably that of St Andrews.

Woolf suggests that the association of Constantine with the raid is a late addition, one derived from a now-lost saga or poem.

It is possible that Constantine had other children, but like the name of his wife, or wives, this has not been recorded.

The Pilgrim of Bordeaux reports in 333: There, at present, by the command of the Emperor Constantine, has been built a basilica, that is to say, a church of wondrous beauty.

According to tradition, Constantine arranged for the rockface to be removed from around the tomb, without harming it, in order to isolate the tomb ; in the centre of the rotunda is a small building called the Kouvouklion ( Kουβούκλιον ; Modern Greek for small compartment ) or Aedicule ( from Latin: aediculum, small building ), which supposedly encloses this tomb, although it is not currently possible to verify the claim, as the remains are completely enveloped by a marble sheath.

One important distinction between the post Constantine I ( reigned 306 AD-312 AD ) emperors and their pagan predecessors was cesaropapism, the assertion that the Emperor ( or other head of state ) is also the head of the Church.

Eusebius ' Life of Constantine ( Vita Constantini ) is a eulogy or panegyric, and therefore its style and selection of facts are affected by its purpose, rendering it inadequate as a continuation of the Church History.

Sargon maintained contacts with several other mages in the DC Universe, notably Baron Winters, Zatara ( a fellow faux stage magician ), and the younger mage John Constantine.

Saint Regulus was galvanized into action by a visionary dream that Emperor Constantine had decided to remove Saint Andrew's relics from Patras to Constantinople.

He continued to lead the conflict against the Arians for the rest of his life and was engaged in theological and political struggles against the Emperors Constantine the Great and Constantius II and powerful and influential Arian churchmen, led by Eusebius of Nicomedia and others.

At one time or another they have characterized him as a political propagandist, a good courtier, the shrewd and worldly adviser of the Emperor Constantine, the great publicist of the first Christian emperor, the first in a long succession of ecclesiastical politicians, the herald of Byzantinism, a political theologian, a political metaphysician, and a caesaropapist.

The two protagonists of the fateful decade 1912 – 1922: King Constantine I of Greece | Constantine I and PM Eleftherios Venizelos in the days of their close cooperation during the Second Balkan War, before the deep political and personal rift between the two materialized and led to the National Schism.

The catastrophe deepened the political crisis, with the returning army rising up under Venizelist officers and forcing King Constantine to abdicate again, in September 1922, in favour of his firstborn son, George II.

On December 11, 361, Julian entered Constantinople as sole emperor and, despite his rejection of Christianity, his first political act was to preside over Constantius ' Christian burial, escorting the body to the Church of the Apostles, where it was placed alongside that of Constantine.

During the 4th century, after more than 300 years of repression and sometimes fierce persecution under various Roman emperors, the church became established as a political as well as a spiritual power under the Emperor Constantine.

* September 17 – King Constantine II of Greece forms a new government with Prime Minister Stephanos Stephanopoulos, in an attempt to end a 2-year-old political crisis.

He became an influential political advisor to emperor Constantine IX Monomachos ( reigned 1042 – 1055 ).

He played a decisive political role in the transition of power from Michael VI to Isaac I Komnenos in 1057 ; then from Isaac Komnenos to Constantine X Doukas ( 1059 ); and then again from Romanos IV Diogenes to Michael VII Doukas ( 1071 ).

It also includes very extensive autobiographical elements about Psellos ' political and intellectual development, and it gives far greater weight to those periods when Psellos held an active position in politics ( especially the reign of Constantine IX ), giving the whole work almost the character of political memoirs.

Constantine refused to accept the self-appointment, and a new political issue resulted.

In June 1973, George Papadopoulos condemned Constantine as " a collaborator with foreign forces and with murderers " and accused him of " pursuing ambitions to become a political leader.

Constantine also studied political science and business in Heidelberg and Leipzig.

In January 1895, Constantine caused political turmoil when he ordered army and gendarmerie forces to break up a street protest against tax policy.

Venizelos notified Constantine that "... political considerations of the utmost importance dictate that Thessaloniki be taken as soon as possible ".

Delano's run was characterised by his political satire, taking on late 1980s and 1990s tropes such as with city financiers being literal demons, and Constantine meeting with Freemasons from the Houses of Parliament.

Seeking political reconciliation, the new Emperor secured the support of the officials in the capital, and surrounded himself with bureaucrats like Stylianos Zaoutzes ( the father of his mistress, Zoe Zaoutzaina ) and the eunuch Samonas, an Arab defector whom Leo raised to the rank of patrikios and who stood in as godfather to Leo ’ s son, Constantine VII.

Constantine V seems to have given the factions a political role in addition to their traditionally ceremonial role.

Most historians agree that Constantine failed to see the political dimensions of his decisions.

Konstantínos G. Karamanlís () ( 8 March 1907 – 23 April 1998 ), commonly anglicised to Constantine Karamanlis or Caramanlis, was a four-time Prime Minister, twice President of the Third Hellenic Republic and a towering figure of Greek politics whose political career spanned much of the latter half of the 20th century.

During the political crisis surrounding Greece's entry into World War I, Papandreou was one of Venizelos's closest supporters against the pro-German King Constantine I.