Abstract
The article is dedicated to the creation and nature of the Bohemian medieval state, which developed in Bohemia during the reign of the first kings of the Luxembourg dynasty and which was named "Corona regni Bohemiae" by Charles IV (since 1348). This term stands for both the sphere of power of the King of Bohemia and its territorial extention (the Luxembourgs joined the following territories to the Kingdom of Bohemia: Silesia, Upper and Lower Lusatia, part of the Upper Palatinate and Egerland).
Charles IV meant for the Crown of Bohemia to be a part of the Holy Roman Empire; as Emperor he was able to confirm it in the legal way too. The Crown of Bohemia was defined on the principles of the co-existence of the various political-territorial subjects, which were hold together only by the figure of the King.
It entered the Early Modern Time as a relatively loose state sui generis. As the time went, it became smaller and smaller; legally seen it however only cease to exist when the new state of Czechoslovakia was created in 1918.