Schloss Klessheim is a Baroque palace located in Wals-Siezenheim, 4km west of Salzburg, Austria. The palace was designed and constructed by Austrian architect Johann Bernhard Fischer von Erlach for Prince-Archbishop Johann Ernst von Thun in 1700. It became the summer residence of the Archbishops of Salzburg. Since 1993, the palace has been used by Salzburg Casino.HistoryIn the late 17th century, Prince-Archbishop Johann Ernst von Thun purchased the small aristocratic estate and Kleshof manor house at this site. In 1700, he commissioned Austrian architect Johann Bernhard Fischer von Erlach to expand the manor house and construct an elegant palace. Influenced by the north Italian Mannerist style, Fischer von Erlach worked on the palace, which was called Lustschloss Favorita, between 1700 and 1709. Construction was interrupted following the archbishop's death in 1709. His successor, Archbishop Franz Anton von Harrach cancelled work in favor of Schloss Mirabell. Schloss Klessheim was completed in 1732 under Archbishop Count Leopold Anton von Firmian, who curtailed the original plans significantly.The completed palace contained a ceremonial hall with an extended terrace and ramp leading to the gardens, an entrance with an impressive Triton Fountain, a loggia and an entrance hall and staircase. The interior stucco work was done by Paolo d'Allio and Diego Francesco Carlone, according to plans by Fischer von Erlach.