Freistadt Castle was built, together with its bergfried, between 1363 and 1398, and was used to reinforce the fortifications of the town of Freistadt. Today the castle houses the tax office and the Mühlviertel Castle Museum.
The building of the castle was begun in 1363 in order to bolster the town's fortifications, Duke Rudolph IV the Founder issuing the orders for its construction. Until it was completed, all the manner of estates within the jurisdiction (Landgericht) of Freistadt were taxed: homes, land, fiefs and farmsteads. After Rudolph's death in 1365, his brothers, Leopold and Albert, continued with the work, and in 1397/98 the new castle and its bergfried were finished. Several improvements continued until 1440 and, in the late 15th century, the height of the bergfried was raised.
The schloss replaced the old castle in Salzgasse street, the Altenhof. From then on the new castle was used by the territorial princes as an administrative centre for the Barony and District of Freistadt and as the residence of the lord's Pfleger. The other district office for the Barony of Freistadt was Schloss Haus (from the 18th century). With the simultaneous expansion of the remaining fortifications, the castle strengthened the defensive capability of the town. Nevertheless, the castle was the weakest point in its lines of defence.
Entry to the castle was achieved then as now in two ways. On one side, access was gained through a gateway to the main courtyard and, on the other, through another gateway at the end of the Schlossgasse leading from the Böhmergasse into the outer courtyard. The castle itself was further separated from the town by a moat and drawbridge. Even the adjoining townhouses were not allowed to have a door into the outer courtyard. The castle was also protected from the town and possible attacks from that direction.
During the Hussite Wars and the numerous border feuds of the 15th century the castle acted as a strong bulwark at the edge of the town. In the 16th century it was significantly remodelled, the plans for the rebuilding of the south wing in 1588 being drawn up by architects Antonio Cerisora, Ambrosio Solari and Mert Pogner. Around 1594 the castle acted as a refuge for the surrounding population during the Turkish Wars. Only once was the castle plundered by besieging troops, in 1626, when rioting peasants captured the town and the castle. The castle's governor and three Capuchin monks were locked in the castle chapel and mistreated. Liturgical objects were stolen and all the boxes and chests broken open and looted.
In the course of time there was also opposition between the town and the castle. One sticking point was a 'back door' (Hintertürl) that led from the castle into the zwinger and over the town moat out of the town; something that had been planned even at the design stage. This enabled residents of the castle to leave the town incognito, but the gate also posed a security risk, which is why it had been bricked up in the 15th century. In 1584, Hans Christoph von Gera pressed for the opening of the gate by drawing attention to the lack of escape during the two great fires of 1507 and 1516. Finally the territorial prince ruled in favour of the town and that the gate should be left walled up.References:
From its origin as a small stronghold built by the ancient Illyrian tribe Dalmatae, becoming a royal castle that was the seat of many Croatian kings, to its final development as a large fortress during the Ottoman wars in Europe, Klis Fortress has guarded the frontier, being lost and re-conquered several times. Due to its location on a pass that separates the mountains Mosor and Kozjak, the fortress served as a major source of defense in Dalmatia, especially against the Ottoman advance, and has been a key crossroad between the Mediterranean belt and the Balkan rear.
Since Duke Mislav of the Duchy of Croatia made Klis Fortress the seat of his throne in the middle of the 9th century, the fortress served as the seat of many Croatia"s rulers. The reign of his successor, Duke Trpimir I, the founder of the Croatian royal House of Trpimirović, is significant for spreading Christianity in the Duchy of Croatia. He largely expanded the Klis Fortress, and in Rižinice, in the valley under the fortress, he built a church and the first Benedictine monastery in Croatia. During the reign of the first Croatian king, Tomislav, Klis and Biograd na Moru were his chief residences.
In March 1242 at Klis Fortress, Tatars who were a constituent segment of the Mongol army under the leadership of Kadan suffered a major defeat while in pursuit of the Hungarian army led by King Béla IV. After their defeat by Croatian forces, the Mongols retreated, and Béla IV rewarded many Croatian towns and nobles with 'substantial riches'. During the Late Middle Ages, the fortress was governed by Croatian nobility, amongst whom Paul I Šubić of Bribir was the most significant. During his reign, the House of Šubić controlled most of modern-day Croatia and Bosnia. Excluding the brief possession by the forces of Bosnian King, Tvrtko I, the fortress remained in Hungaro-Croatian hands for the next several hundred years, until the 16th century.
Klis Fortress is probably best known for its defense against the Ottoman invasion of Europe in the early 16th century. Croatian captain Petar Kružić led the defense of the fortress against a Turkish invasion and siege that lasted for more than two and a half decades. During this defense, as Kružić and his soldiers fought without allies against the Turks, the military faction of Uskoks was formed, which later became famous as an elite Croatian militant sect. Ultimately, the defenders were defeated and the fortress was occupied by the Ottomans in 1537. After more than a century under Ottoman rule, in 1669, Klis Fortress was besieged and seized by the Republic of Venice, thus moving the border between Christian and Muslim Europe further east and helping to contribute to the decline of the Ottoman Empire. The Venetians restored and enlarged the fortress, but it was taken by the Austrians after Napoleon extinguished the republic itself in 1797. Today, Klis Fortress contains a museum where visitors to this historic military structure can see an array of arms, armor, and traditional uniforms.