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Constantine I
Definition by Donald L. Wasson

Constantine I

Constantine I 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 rule of four. While he ruled...
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...
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...
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 CE purporting to be an original 4th-century CE document in which the Roman emperor Constantine the Great (r. 306-337 CE...
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...
Byzantine Empire
Definition by Mark Cartwright

Byzantine Empire

The Byzantine Empire, often called the Eastern Roman Empire or simply Byzantium, existed from 330 to 1453 CE. With its capital founded at Constantinople by Constantine I (r. 306-337 CE), the Empire varied in size over the centuries, at one...
The Medieval Church
Definition by Joshua J. Mark

The Medieval Church

Religious practice in medieval Europe (c. 476-1500 CE) was dominated and informed by the Catholic Church. The majority of the population was Christian, and “Christian” at this time meant “Catholic” as there was initially...
Constantinople
Definition by Donald L. Wasson

Constantinople

Built in the seventh century BCE, the ancient city of Byzantium proved to be a valuable city for both the Greeks and Romans. Because it lay on the European side of the Strait of Bosporus, the Emperor Constantine understood its strategic importance...