"In heraldry and vexillology, the double-headed eagle (or double-eagle) is a charge associated with the concept of Empire. Most modern uses of the symbol are directly ...
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or indirectly associated with its use by the Roman/Byzantine Empire, whose use of it represented the Empire´s dominion over the Near East and the West. The symbol is much older, and its original meaning is debated among scholars. The eagle has long been a symbol of power and dominion.
The double-headed eagle or double-eagle is a motif that appears in Mycenaean Greece and in the Ancient Near East, especially in Hittite iconography. It re-appeared during the High Middle Ages, from circa the 10th or 11th century, and was notably used by the East Roman Empire, but 11th or 12th century representations have also been found originating from Islamic Spain, France and the Serbian principality of Raška. From the 13th century onward, it became even more widespread, and was used by the Seljuk Sultanate of Rum and the Mamluk Sultanate within the Islamic world, and by the Holy Roman Empire, Serbia and Russia within the Christian world." - (en.wikipedia.org 29.04.2020)
