The bottom part of the square is dominated with the monumental Baroque column of Holy Trinity dating from the period 1723-1724, sometimes also called Plague Column.

Prince Walter Xavier of Dietrichstein had the column made by stonecutter Andreas Steinböck on the basis of graphic design by A. J. Prenner.

The statues (St. John of Nepomuk, St. František Xaverský and St. Karel Boromejský) are the work of Ignác Lengelacher.

The monument erected over a hexagonal base with several steps with a triad of Tuscan pillars is crowned with a trihedral pyramid with the symbol of Holy Spirit standing on the heaven sphere with clouds and little angels and with the statues of God the Father and God the Son Jesus Christ.

The column was repaired in the years 1897 and further in 1997-1998.