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Karlštejn Castle (Czech: Hrad Karlštejn; German: Burg Karlstein) is a large Gothic castle founded 1348 AD by Charles IV, Holy Roman Emperor-elect and King of Bohemia. The castle served as a place for safekeeping the Imperial Regalia as well as the Bohemian/Czech crown jewels, holy relics, and other royal treasures. Located about 30 km southwest of Prague above the village of the same name, it is one of the most famous and most frequently visited castles in the Czech Republic.
Founded in 1348, the construction works were directed by the later Karlštejn burgrave Vitus of Bítov, but there are no records of the builder himself. Some historian speculate that Matthias of Arras may be credited with being the architect, but he had already died by 1352. It is likely that there was not a progressive and cunning architect, but a brilliant civil engineer who dextrously and with a necessary mathematical accuracy solved technically exigent problems that issued from the emperor's ideas and requests. Instead, Holy Roman Emperor Charles IV personally supervised the construction works and interior decoration. A little known fact is that the Emperor hired Palatinate region labour for the remaining work. Construction was finished nearly twenty years later in 1365 when the "heart" of the treasury – the Chapel of the Holy Cross situated in the Great tower – was consecrated.
Following the outbreak of the Hussite Wars, the Imperial Regalia were evacuated in 1421 and brought via Hungary to Nuremberg. In 1422, during the siege of the castle, Hussite attackers used biological warfare when Prince Sigismund Korybut used catapults to throw dead (but not plague-infected) bodies and 2000 carriage-loads of dung over the walls, apparently managing to spread infection among the defenders.
Later, the Bohemian crown jewels were moved to the castle and were kept there for almost two centuries, with some short breaks. The castle underwent several reconstructions: in late Gothic style after 1480, in Renaissance style in the last quarter of the 16th century. In 1487 the Big tower was damaged by fire and during the 16th century there were several adaptations. During the Thirty Years' War in 1619, the coronation jewels and the archive were brought to Prague, and in 1620 the castle was turned over to Ferdinand II, Holy Roman Emperor. After having been conquered in 1648 by Swedes, it fell in disrepair. Finally, a neo-Gothic reconstruction was carried out by Josef Mocker between 1887 and 1899, giving the castle its present look.
The nearby village was founded during the construction of the castle and bore its name until it was renamed to Buda in the wake of the Hussite Wars. Renamed to Budňany in the 18th century, it was merged with Poučník and called Karlštejn (Beroun District). There is a golf club named after the castle nearby.
The castle was built upon a promontory from the south side of Kněží hora hill, divided from it by a narrow sag. The first gate, a square, two-storey tower with a tall hip roof, stood above a moat at the western slope of the promontory. It was connected with the rampart traverse by means of a small portal. The traverse was protected by battlement and divided by a covered bastion in the middle. The second gate led to the Burgrave House (Purkrabství) courtyard. Drawbridges closed both entrances. The Burgrave House formed the Karlštejn settlement, it was fortified with a two meters wide rampart, the Well Tower stood slightly lower. In the burgraviate's rampart a third gate was staved - the main entrance into the inner castle.
The core of the castle consisted of three parts placed on three levels-differentiated terraces; every level express different importance. On the lowest terrace there stood the Imperial Palace (Císařský palác), above it there was the Marian Tower (Mariánská věž) and the Big Tower (Velká věž) stood the highest. The Palace is a single-tract building, about 12,5 m wide and 46 m long, closed in the east by a semi-cylinder tower, had – aside of the cellar dug in the rock – the ground floor and two walled floors; the third floor under the roof was built from half-timbered work. The ground space is open to the courtyard, the rest was occupied by a granary. Three rooms form the first floor; largest is the central room, the so-called Knight Hall (Rytířský sál). The emperor inhabited the second floor of the palace; the floor was divided into four rooms by self-supporting partitions. A spiral staircase connected it with the third floor in which – according to the record from the 16th century – there was a residence of the "empress with her female retinue". The layout and equipment of the second and third floor was approximately the same: bedrooms on the eastern side, then the stateroom, a hall and the rooms in the west.
The central area of the 60m high and separately fortified (4–7,5 m thick walls) Big Tower is the Chapel of the Holy Cross (kaple sv. Kříže); it has no analogy in concept elsewhere in the world. In the safety of the chapel, behind four doors with nineteen locks to each key was guarded independently, the valuable documents of the state archive were kept along with the symbols of the state power – the Imperial Regalia, later the Czech Crown Jewels.
The Well Tower (Studniční věž), being the logistical centerpiece the castle could not function without, was the first part of the castle to be built. Miners were brought in from the mining town of Kutná Hora, however, water was not encountered even after the depth of the well was 70 meters, well below the level of the nearby Berounka river. An underground channel was therefore excavated to bring in water from a nearby stream, yielding a water column of 25 meters, sufficient to last for several months. The reservoir had to be manually refilled roughly twice a year by opening a floodgate. Considering the significant strategic weakness incurred to the castle by the lack of an independent water source, the existence of the underground channel was a state secret known only to the Emperor himself, and the burgrave. The only other persons aware of its existence were the miners, who were however allegedly massacred on their way from the castle after the construction, leaving no survivors.
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