[1] Frederick habitually signed buildings such as Santa Maria dell'Anima in Rome,[2] Burg Wiener Neustadt, or Graz Cathedral as well as his tableware and other objects with the vowel graphemes.
[5] Contemporary research has shown that the Roman chancellery of Frederick III used the interpretation En amor electis iniustis ordinor ultor.
It was also supposed that the Austriae est imperare variants probably go back to Frederick's proto-notary Heinrich Leubing.
[1][7][8] This verse was probably adopted by Frederick from a poem by Nicolaus Petschacher of Znaim who worked as a court official in the 1440s.
Many Latin and German interpretations have been attempted over the centuries; most of these versions refer to a motto of present-day Austria or the extensive Habsburg monarchy.