Quaternion Eagle
Unofficial coat of arms of the Holy Roman Empire
Quaternion Eagle
The Quaternion Eagle (German: Quaternionenadler; Italian: aquila quaternione), also known as the Imperial Quaternion Eagle (German: Quaternionen-Reichsadler) or simply Imperial Eagle (German: Reichsadler), was an informal emblem of the Holy Roman Empire. It mixed two pre-existing concepts: the Imperial Quaternions and the Imperial Eagle (double-headed eagle).
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