Double Headed Eagle
The Double-Headed Eagle with a red background was the insignia of the Byzantine Empire founded by Constantine the Great. He was a member of the Atonist Sol Invicti cult. His armed guards were called the "Golden Militia," and they wore the symbol of the Double-Headed Eagle.
The two crossed keys and golden eagle of Vatican City. Like the double-headed eagle of Freemasonry, or the royal lion and unicorn insignia, these emblems symbolize the dialectic of Judaism and Christianity - two arms serving the same brain.
The symbol of the Scottish Rite of Freemasonry is the double eagle with a head looking in both directions - the symbol of Nimrod.