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753 BC – AD 476
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Strictly speaking, the word draconarius denotes the bearer of the military standard on which a dragon was represented. The term passed into Christian usage, and was applied to the bearer of the labarum in battle, and also to cross-bearers in church processions. 
From the conquered Dacians, the Romans in Trajan's time borrowed the dragon ensign which became the standard of the cohort as the eagle was that of the legion. Probably Dacian in origin, the draco was later generally introduced in the fourth century as a Roman standard.
It consisted of a bronze dragon head with a fabric body similar in shape to a tail behind it. Wind flowed through the gaping mouth and billowed out the cloth tail much like a modern windsock. It is thought that some form of whistle was mounted in the dragon's neck to make a terrifying noise when galloping.
- Den Boeft, J.; Den Hengst, D. (1987). Philological and historical commentary on Ammianus Marcellinus XX: Volume 4 edited by H. C. Teitler (in English). John Benjamins Pub Co. ISBN 978-90-6980-012-7.
- Smith, Sir William; Cheetham, Samuel (1875). Dictionary of Christian antiquities:. Little, Brown and Company.
- Tyrwhitt, Richard (2005). The Art Teaching of the Primitive Church with an Index of Subjects, Historical and Emblematic (in English). Kessinger Publishing. ISBN 978-1-4179-7439-9.
- Yust, Walter (1953). Encyclopaedia britannica: a new survey of universal knowledge:. Encyclopaedia Britannica.
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