Are you sure about Augusta per angusta? I thought it was Augusta per (or par?) Augusta. Referring to King of all Kings or Greatest of the Great. Alternatively most noble or imperial. In 27 BC the Roman Senate added the honorific Augustus "Majestic" as a title for future rulers. Definition of August: having great important and especially of the highest social class. Synonyms; noble, kingly, grand. From French auguste ("noble, stately") or Latin augustus ("majestic, imperial, royal"). Makes sense within the song.