Flags are the standards of national myth.Take a look at the flag pictured at the top of the post. What can we tell about the nation it represents?Obviously, a monarchy. The crown is a dead give-away.And the national creed is not subtle. Right in your face. Religion. Union. Independence. All in a romance language.It would be understandable if a reader thought he was looking at an early version of a flag from the Kingdom of Italy. But it's not. It is the personal banner of the first ruler of post-independence Mexico: Emporer Agustín de Iturbide.