A.E.I.O.U.

Also known as A E I O U, AEIOU

thumb|Illumination from the records of King Frederick, dated 1446 "A.E.I.O.U." (sometimes spelled A.E.I.O.V.) was a symbolic device coined by Emperor Frederick III (1415–1493) and historically used as a motto by the Habsburgs. One note in his notebook (discovered in 1666), though not in the same hand, explains it in German and Latin as "All the world is subject to Austria" ( or ). Frederick habitually signed buildings such as Santa Maria dell'Anima in Rome, , or Graz Cathedral as well as his tableware and other objects with the vowel graphemes. A.E.I.O.U. is also the motto of the Theresian Mil