The Czech lands or the Bohemian lands[1][2][3] (Czech: České země, pronounced[ˈtʃɛskɛːˈzɛmɲɛ]) is a historical-geographical term which, in a historical context, denotes the three historical regions of Bohemia, Moravia, and Czech Silesia out of which Czechoslovakia, and later the Czech Republic, were formed. Together the three have formed the Czech part of Czechoslovakia since 1918, 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 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.[citation needed]
The oldest depiction of coat of arms of Bohemia (left) and Moravia (right), castle Gozzoburg in Krems, fresco painting from the beginning of the 13th century
The term Czech lands has been used to describe different things by different people. While the Czech name of Bohemia proper is Čechy, the adjective český refers to both "Bohemian" and "Czech". The non-auxiliary term (i.e. the term used in official Czech geographical terminology lists) for the present-day Czech lands (i.e. Bohemia, Moravia, Czech Silesia) is Česko, documented as early as 1704.[citation needed]
During the period of the First and Second Czechoslovak Republics, the Czech lands were frequently referred to as Historical lands, in particular when mentioned together with Slovakia (which was never an autonomous historical region within the Kingdom of Hungary).
The Bohemian lands had been settled by Celts (Boii) from 5th century BC until the 2nd century AD, and then by various Germanic tribes (Marcomanni, Quadi, Lombards and others) until they moved on to the west during the Migration Period (1st–5th century). At the beginning of the 5th century the population decreased dramatically and, according to mythology, was led by a chieftain named Čech. The first Western Slavs came in the second half of the 6th century. In the course of the decline of the Great Moravian realm during the Hungarian invasions of Europe in the 9th and 10th centuries, the Czech Přemyslid dynasty established the Duchy of Bohemia. Backed by the East Frankish kings, they prevailed against the reluctant Bohemian nobility and extended their rule eastwards over the adjacent Moravian lands.
The coat of arms of the Czech Republic incorporates those of the three integral Czech lands: Bohemia proper, Moravia, and Czech Silesia. The arms of Bohemia originated with the Kingdom of Bohemia, like those of Moravia with the Moravian margraviate. The arms of Czech Silesia originated as those of all of the historical region of Silesia, much of which is now in Poland.
Bohemia, also used as the Lesser coat of arms of the modern Czech Republic