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Roman Empire
The Roman Empire, at its height (c. 117 CE), was the most extensive political and social structure in western civilization. By 285 CE the empire had grown too vast to be ruled from the central government at Rome and so was divided by Emperor...

Definition
Charlemagne
Charlemagne (Charles the Great, also known as Charles I, l. 742-814) was King of the Franks (r. 768-814), King of the Franks and Lombards (r. 774-814), and Holy Roman Emperor (r. 800-814). He is among the best-known and most influential figures...

Definition
Trinity
The Christian doctrine of the Trinity (from the Latin trinus, meaning "threefold") professes that there is one God, but three eternal and consubstantial persons (aspects): the Father, the Son, and the Holy Spirit. The Father is the God of...

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Constantine I
The colossal bronze head from a statue of Constantine I, 4th century CE. The head is 1.77 m high. (Capitoline Museums, Rome).

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Constantine's Vision
Constantine I's (r. 306-337 CE) vision and the Battle of the Milvian Bridge in a 9th-century Byzantine manuscript. Detail from folio 440 recto of manuscript BnF MS Gr510, dated 879-883 and containing the homilies of Gregory of Nazianzus...

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Constantine VII & Christ
This ivory plaque fragment shows Emperor Constantine VII Porphyrogenitus of Byzantium (r. 913-959 CE) being crowned by Jesus Christ. It was carved in royal workshops of Constantinople around 954 CE. (Pushkin Museum, Moscow)

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Constantine I Colossus
The head, hand and sphere (symbol of power) from the colossal bronze statue of Constantine I, 4th century CE. The head alone is 1.77 m high. (Capitoline Museums, Rome).

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Constantine IV
A 7th century CE mosaic depicting the Byzantine emperor Constantine IV (r. 668-685 CE) and entourage in the basilica of Sant'Apollinare, in Classe, Ravenna, Italy.

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Constantine VII & Romanos II
A gold Byzantine nomisma coin depicting Emperor Constantine VII (r. 945-959 CE) and his son and successor Romanos II (r. 959-963 CE).

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Dacian Prisoners, Arch of Constantine
Detail View - Dacian prisoners, North Façade Reliefs of Arch of Constantine, Rome, Italy. The arch celebrates the triumph of the emperor Constantine over Maxentius, which took place on October 28, 312 CE, following the victorious battle at...