Jan Hus wrote his influential works 'Postilla' and 'De ecclesia' while seeking refuge at this castle.
The castle was originally built as a defensive residence for the noble house of Sezima of Ústí.
The name 'Kozí' translates to 'Goat' in English, likely derived from the name of the original owners or local topography.
It is one of the few surviving sites in the Czech Republic directly associated with the Hussite reform movement's early days.
The castle layout follows a two-part defensive system comprising the main tower and a protected courtyard.
The site was abandoned in the 15th century and never rebuilt, preserving its medieval architectural integrity.
Archaeological digs found evidence of advanced heating systems, including tiled stoves, within the residential chambers.
Kozí hrádek (Goat Castle) is the well-preserved ruin of a 14th-century Gothic castle located near Sezimovo Ústí. It gained historical significance as one of the last refuges of the religious reformer Jan Hus, who preached here in 1413 and 1414. The site features foundations of the main residential palace and the perimeter walls of the castle core. Archaeological excavations have revealed diverse medieval pottery and iron artifacts. The structure fell into decay following a fire in the 15th century. It is currently managed as a protected cultural monument accessible to the public. The site offers insight into the defensive architecture typical of South Bohemian noble residences of that era. Recent restoration efforts have stabilized the remaining masonry.
The elevated vantage point on the approach path providing a full silhouette of the ruins against the forest canopy.
Wear sturdy, closed-toe footwear as the terrain consists of uneven stone ruins and grass paths.
Bring binoculars to better view the masonry details on the higher wall sections.
Combine the visit with a walk along the Lužnice River, which flows nearby.
Do not attempt to visit immediately after heavy rainfall, as the unpaved paths around the ruins become exceptionally muddy and slippery.
Open seasonally from spring through autumn; closed during the winter months.
Stay on marked paths; climbing on the ruin walls is strictly prohibited for safety and preservation.
