String A.E.I.O.U. in Graz

AEIOU at the Burg of Graz

An interesting detail of Graz: There are a lot of signs mentioning the string A.E.I.O.U. This was used by the Habsburg Emperor Frederick III who resided in Graz for many years. The meaning of this string is still unsolved. [German]

This sign I discovered at the walls of the former castle of Graz named Grazer Burg. It is placed next to the famous twin spiral stairs. By the way the same combination of letters I also saw at a sundial in Merano.

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