The Znojmo Castle was initially a wooden structure built by the Přemyslid Duke Bretislav I, and completed around 1080.
The structure was intended to replace an old castle across the Granice Valley, as part of an attempt at strengthening the defenses along the river Thaya against Austrian attack.
The importance of Znojmo Castle diminished near the end of the 17th century, after the Turkish threat was averted by Prince Eugene of Savoy.
The front end of the castle was sold to local citizens and became the town brewery, producing Hostan beer.
The rear of the castle came into the hands of the Lords of Deblin who built a Baroque chateau on the space, which still stands.