[KarlInOhio]

The Austrian School of economic thought was devised by a handful of economists in Austria in the 15th century; otherwise, it has nothing to do with the country.

I question that date. That was well before Adam Smith and the Wealth of Nations. Wikipedia (yes, I know the warnings) says:

It originated in late-19th and early-20th century Vienna with the work of Carl Menger, Eugen von Böhm-Bawerk, Friedrich von Wieser, and others. (citing Joseph A. Schumpeter, History of economic analysis, Oxford University Press 1996).

[ICU812]

You're right that Menger is considered the founder of the Austrian School. I think his reference to the 15th century is a reference to the "Late Scholastics", catholic theologians and acolytes of Thomas Aquinas that tried to reconcile economics with christian dogma during that time period. But they were mostly Spaniards. The name "Austrian" was first applied to the school in a mocking, belittling way by the the Historical School after Menger criticized them in a pamphlet called "The Errors of Historicism in German Economics" which launched the so-called Methodenstreit between the two schools of thought.