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Constantine I
Definition by Donald L. Wasson

Constantine I

Constantine I, aka Constantine the Great, was Roman emperor from 306 to 337 CE. Realizing that the Roman Empire was too large for one man to adequately rule, Emperor Diocletian (284-305 CE) split the empire into two, creating a tetrachy or...
Constantine’s Conversion to Christianity
Article by Rebecca Denova

Constantine’s Conversion to Christianity

Constantine I (Flavius Valerius Constantinus) was Roman emperor from 306-337 CE and is known to history as Constantine the Great for his conversion to Christianity in 312 CE and his subsequent Christianization of the Roman Empire. His conversion...
Constantine VII
Definition by Mark Cartwright

Constantine VII

Constantine VII was Byzantine emperor from 945 until 959 CE. Sometimes known as Constantine Porphyrogennetos because of his birth in the purple chamber of the royal palace, he was served by various regents from 912 CE until reigning in his...
Constantine X Doukas
Definition by Michael Goodyear

Constantine X Doukas

Constantine X Doukas was the ruler of the Byzantine Empire from 1059 to 1067 CE. During his reign, the Byzantine Empire was attacked by emerging enemies on all sides, including the Normans in Italy and the Seljuk Turks in Armenia and Anatolia...
Constantine VI
Definition by Mark Cartwright

Constantine VI

Constantine VI, also known as Constantine "the Blinded”, was emperor of the Byzantine Empire from 780 to 797 CE, although for most of his reign his mother, Irene the Athenian, ruled as regent. When Constantine did finally get a go at ruling...
Constantine V
Definition by Mark Cartwright

Constantine V

Constantine V, also known as Constantine the Dung-named by his enemies, was emperor of the Byzantine empire from 741 to 775 CE. He enjoyed military successes in the Middle East and Balkans but his reign is chiefly remembered for his systematic...
Constantine IV
Definition by Mark Cartwright

Constantine IV

Constantine IV ruled as emperor of the Byzantine empire from 668 to 685 CE. His reign is best remembered today for the five-year Arab siege of Constantinople from 674 CE, which the Byzantines resisted thanks to their strong fortifications...
Donation of Constantine
Definition by Joshua J. Mark

Donation of Constantine

The Donation of Constantine (Donatio Constantini or the Donatio) is a medieval forgery dated to the 8th century purporting to be an original 4th-century document in which the Roman emperor Constantine the Great (r. 306-337) granted supreme...
Eusebius on Christianity
Article by Rebecca Denova

Eusebius on Christianity

Eusebius Pamphili (aka Eusebius of Caesarea, 260-340 CE) was a Christian historian, exegete, and polemicist. He became the bishop of Caesarea Maritima in 314 CE and served as court bishop during the reign of Constantine I (r. 306-337 CE...
The Arch of Constantine, Rome
Article by Mark Cartwright

The Arch of Constantine, Rome

The Arch of Constantine I, erected in c. 315 CE, stands in Rome and commemorates Roman Emperor Constantine's victory over the Roman tyrant Maxentius on 28th October 312 CE at the battle of Milvian Bridge in Rome. It is the largest surviving...
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