Prague Castle in the context of "Protectorate of Bohemia and Moravia"

The Duchy of Bohemia, also later referred to in English as the Czech Duchy, (Old Czech: Češské kniežěstvie) was a monarchy and a principality of the Holy Roman Empire in Central Europe during the Early and High Middle Ages. It was formed around 870 by Czechs as part of the Great Moravian realm. Bohemia separated from disintegrating Great Moravia after Duke Spytihněv swore fealty to the East Frankish king Arnulf in 895.

While the Bohemian dukes of the Přemyslid dynasty, at first ruling at Prague Castle and Levý Hradec, brought further estates under their control, the Christianization initiated by Saints Cyril and Methodius was continued by the Frankish bishops of Regensburg and Passau. In 973, the Diocese of Prague was founded through the joint efforts of Duke Boleslaus II and Emperor Otto I. Later Duke Wenceslaus I of Bohemia, killed by his younger brother Boleslaus in September 935, became the land's patron saint.

The Czech lands (Czech: České země, pronounced [ˈtʃɛskɛː ˈzɛmɲɛ]) is a historical-geographical term which denotes the three historical regions of Bohemia, Moravia, and Czech Silesia out of which Czechoslovakia, and later the Czech Republic and Slovakia, were formed. Together the three have formed the Czech part of Czechoslovakia since 1919, and the Czech Republic since 1 January 1993.

In a historical context, Czech texts use the term to refer to any territory ruled by the Kings of Bohemia, i.e., the lands of the Bohemian Crown (země Koruny české) as established by Emperor Charles IV in the 14th century. This includes territories like the Lusatias (which in 1635 fell to Saxony) and the whole of Silesia, which at the time were all ruled from Prague Castle. Since the conquest of Silesia by the Prussian king Frederick the Great in the First Silesian War in 1742, the remaining lands of the Bohemian Crown—Bohemia, Moravia and Austrian Silesia—have been more or less co-extensive with the territory of the modern-day Czech Republic.

A camera obscura (pl. camerae obscurae or camera obscuras; from Latin camera obscūra 'dark chamber') is the natural phenomenon in which light passing through the small hole of a dark chamber or box will project an image of a scene outside the chamber (box) onto the surface opposite to the hole, resulting in an inverted (upside down) and reversed (left to right) projection of the view outside.

Camera obscura refers to analogous constructions such as a darkened room, box or tent in which an exterior image is projected inside or onto a translucent screen viewed from outside. Camera obscuras with a lens in the opening have been used since the second half of the 16th century and became popular as aids for drawing and painting. The technology was developed further into the photographic camera in the first half of the 19th century, when camera obscura boxes were used to expose light-sensitive materials to the projected image.

The military occupation of Czechoslovakia by Nazi Germany began with the German annexation of the Sudetenland in 1938, continued with the creation of the Protectorate of Bohemia and Moravia, and by the end of 1944 extended to all parts of Czechoslovakia.

Following the Anschluss of Austria in March 1938 and the Munich Agreement in September of that same year, Adolf Hitler annexed the Sudetenland from Czechoslovakia on 1 October, giving Germany control of the extensive Czechoslovak border fortifications in this area. The incorporation of the Sudetenland into Germany left the rest of Czechoslovakia ("Rest-Tschechei" ) with a largely indefensible northwestern border. Also a Polish-majority borderland region of Trans-Olza which was annexed by Czechoslovakia in 1919, was occupied and annexed by Poland following the two-decade long territorial dispute. Finally the First Vienna Award gave to Hungary the southern territories of Slovakia and Carpathian Ruthenia, mostly inhabited by Hungarians.

The Archdiocese of Prague (Praha) (Latin: Archidioecesis Pragensis; Czech: Arcidiecéze pražská) is a Metropolitan Latin archdiocese of the Catholic Church in Bohemia, in the Czech Republic.

The cathedral archiepiscopal see is St. Vitus Cathedral, in the Bohemian and Czech capital Prague, entirely situated inside the Prague Castle complex. Jan Graubner is the current archbishop.

Czech Renaissance architecture refers to the architectural period of the early modern era in Bohemia, Moravia and Czech Silesia, which then comprised the Crown of Bohemia and today constitute the Czech Republic. The Renaissance style flourished in the Czech lands from the late 15th century to the first half of the 17th century.

In the Crown of Bohemia as well as in other parts of Central Europe the Renaissance style was accepted slower than in southern Europe and its development was delayed in comparison with Italy. It was partly caused by the situation in the Kingdom after the Hussite Wars. The Bohemian Reformation was mistrustful of the influences coming from "papal" Italy and rather respected the traditional values expressed with the older Gothic style. Therefore, the first examples of Renaissance architecture in the Czech lands can be found in the domains of the Catholic aristocracy or the Catholic king. The Renaissance style first appeared in the Czech Kingdom in the 1490s. Bohemia (together with its incorporated lands, especially Moravia) thus ranked among the areas of the Holy Roman Empire with the earliest known examples of Renaissance architecture.

The Metropolitan Cathedral of Saints Vitus, Wenceslaus and Adalbert (Czech: metropolitní katedrála svatého Víta, Václava a Vojtěcha) is a Catholic metropolitan cathedral in Prague, and the seat of the Archbishop of Prague. Until 1997, the cathedral was dedicated only to Saint Vitus, and is still commonly named only as St. Vitus Cathedral (Czech: katedrála svatého Víta or svatovítská katedrála).

This cathedral is a prominent example of Gothic architecture, and is the largest and most important church in the country. Located within Prague Castle and containing the tombs of many Bohemian kings and Holy Roman Emperors, the cathedral is under the ownership of the Czech government as part of the Prague Castle complex. The cathedral's dimensions are 124 m × 60 m (407 ft × 197 ft), the main tower is 102.8 m (337 ft) high, front towers 82 m (269 ft), arch height 33.2 m (109 ft).