
The Army takes an Oath to the Emperor after the Distribution of Eagles, 5 December 1804 – 1810 painting by Jacques-Louis David (public domain)
(17) ROMAN IMPERIAL METRIC – EAGLE & CAESAR
But is it a Roman Empire with eagle and Caesar? Is it an eagle empire?
Yes, it’s another Roman imperial metric, but this time more narrowly by its imperial standard or symbolism, as well as the adaptation of Caesar as imperial title.
The use of eagle as symbol for imperial states, with one or two heads, both precedes its use by the Romans and also extends well beyond those adapting Roman usage, because the eagle is a pretty impressive bird. It could well be the subject of its own top ten list – or lists, one for those adapting Roman usage and one for those not adapting Roman usage. Even the Roman usage overlapped with the Christian usage of the eagle as the symbol of St John the Evangelist.
An example of the eagle being used by an imperial state preceding the Roman usage is that by the Persian Achaemenid Empire.
A clear example of the eagle being used by states not influenced by or adapting Roman usage is that of the Aztecs, subsequently adopted by Mexico for its coat of arms and flag.
Adapting Roman usage from the western Roman empire, there was the Holy Roman Empire and its various ‘successors’ – the Hapsburgs (and through them the Spanish Empire), Austria, and Germany, the last most infamously in the Third Reich. There was also Napoleonic France, which also adapted the use of the Roman aquila or eagle as a standard for legions and their military reputation.
From the eastern Roman empire, there was Trebizond, Serbia, Bulgaria, Albania, and imperial Russia, although that last is usually now superseded in animal symbolism by the bear.
The most famous contemporary usage of the eagle as national symbol is that of the United States – although clearly influenced by the Roman model (as it was for much of the politics of its founding), it adapted that to the bald eagle as a bird uniquely native to their continent.
As for the usage of Caesar as imperial title, that generally follows the title in German or Slavic.
The usage in German – kaiser – is best known for its usage as title in the Second Reich. That is, imperial Germany from 1871 to the First World War.
The usage in Slavic – mostly commonly translated in English as tsar and czar (but also less commonly as tzar and csar) – is best known for its usage as title in Imperial Russia. However, it was also used as Serbia, as well as commonly used in American political circles as an informal title for an overarching government portfolio, such as drug czar or energy czar.

