Suscipe Clementissime Deus, Servi Tui Demisse Te Adorantis Vota: Et Me, Coniugem, Liberos, Domumque Meam: Populos Et Exercitus Meos: Regna Ac Provincias: Continua Misericordiae Tuae Protectione Guberna, Custodi, Defende! Ita VoVI: anno DoMInI saLVatorIs NostrI IesU ChrIstI

The Plague Column, or the Holy Trinity Column (Dreifaltigkeitssäule), was placed after the great plague that hit Vienna in 1679, which was apparently a bubonic plague, in which about 100,000 Viennese died.

Emperor Leopold I vowed that if the epidemic ended, he would erect a pillar of mercy, a pillar that was placed in 1693. The pillar went through many incarnations until it was placed, among other things, the well-known architect Johann Bernhard Fischer von Erlach participated in its design.

The pillar was taken that day Click for a larger image Click for a larger image

In the detailed picture you can see the address:
Deo Filio Redemptori
God and the Redeemer Son.
as well as the coat of arms of the Hungarian royal house (the great coat of arms), and the coats of arms of Croatia, Bosnia and Dalmatia
Click for a larger image

Translation of the text on the sign:
To you, Holy and Indivisible Trinity: I, Leopold, your humble servant, thank you as much as I can, that in the year 1679, by your supreme grace, the deadly plague was averted from this city and country of Austria: and as a perpetual token of gratitude, I humbly dedicate to you this monument.