Cieszyn Silesia covers the area of the former Duchy of Teschen, which existed from 1290 to 1918. Before 1290 the area constituted a
castellany, which together with Castellany of
Racibórz formed the
Duchy of Racibórz in 1172. From 1202 it was a part of the united
Duchy of Opole and Racibórz. From 1290 to 1653 the Duchy of Cieszyn/Teschen was ruled by the local branch of the
Piast dynasty. In 1327
Casimir I, Duke of Cieszyn, swore
homage to the Bohemian king
John of Bohemia, and the duchy became an autonomous
fiefdom of the
Kingdom of Bohemia and later the
Bohemian Crown. Piast rule continued until 1653 and the death of the last Piast descendant,
Elizabeth Lucretia, Duchess of Cieszyn, after which it lapsed directly to the Kings of Bohemia, at that time from the
Habsburg dynasty. From 1722, the dukes of Teschen hailed from the
Dukes of Lorraine dynasty, from 1767 to 1822 from the
Wettin dynasty, and from 1822 to 1918 from the
Habsburg-Lorraine dynasty. Cieszyn Silesia was cemented as a uniform historic, geopolitical, socio-cultural and economic entity during the period of Habsburg rule. It is distinct from the rest of Silesia because after the
First Silesian War between the
Habsburg Monarchy and
Prussia it remained
part of Austria, whereas most of Silesia became a part of Prussia. After the end of
World War I, both of the two newly created independent states of
Poland and
Czechoslovakia claimed the area. Czechoslovakia claimed the area partly on historic and ethnic grounds, but especially on economic and strategic grounds. The area was important for the Czechs, as the crucial railway line connecting
Czech Silesia with
Slovakia crossed the area (the
Košice–Bohumín Railway, which was one of only two railroads that linked the Czech provinces to Slovakia at that time). The western area of Cieszyn Silesia is also very rich in
coal. Many important
coal mines, facilities and
metallurgy factories are located there. The Polish side based its claim to the area on ethnic criteria: a majority of the area's population was Polish according to the last (1910) Austrian census. Two local self-government councils, Polish and Czech, were created. Initially, both national councils claimed the whole of Cieszyn Silesia for themselves, the Polish
Rada Narodowa Księstwa Cieszyńskiego in its declaration "Ludu śląski!" of 30 October 1918 and the Czech
Národní výbor pro Slezsko in its declaration of 1 November 1918. On 31 October 1918, in the wake of
World War I and the dissolution of Austria-Hungary, most of the area was taken over by local Polish authorities. The short-lived interim agreement of 2 November 1918 reflected the inability of the two national councils to come to final
delimitation, In 1919 the councils were absorbed by the newly created and independent central governments in
Prague and
Warsaw. The former was not satisfied with the situation and on 23 January 1919
invaded the area while both parties were engaged in much larger conflicts elsewhere, Poland in
its war against the
West Ukrainian National Republic and
Czechoslovakia in the war with the
Hungarian Soviet Republic over
Upper Hungary. The impetus for the Czech invasion in 1919 was Poland's organising of
elections to the
Sejm (parliament) of
Poland in the disputed area. The elections were to be held in the whole of Cieszyn Silesia. The Czechs claimed that the polls must not be held in the disputed area, as the delimitation was only interim and no sovereign rule should be executed there by any party. The Czech demand was rejected by the Poles and, following the rejection, Czechs decided to resolve the issue by force. A plebiscite could not be held in this atmosphere. On 10 July both sides renounced the idea of plebiscite and entrusted the
Conference of Ambassadors with the decision. Eventually 58.1% of the area of Cieszyn Silesia, along with 67.9% of the population, was taken over by
Czechoslovakia on 28 July 1920 by decision of the
Spa Conference. This decision divided a historically unified region, leaving a sizeable
Polish minority in Czechoslovakia and in practice created
Trans-Olza, the eastern part of the Czech part of Cieszyn Silesia delimited by the
Olza River. The division of 1920 had an immediate impact on the life of the region. Many families were divided by the new border. Several municipalities were divided between the two states—
Cieszyn (PL) /
Český Těšín (CS),
Leszna Górna (PL) /
Horní Líštná (CS), and
Marklowice Górne (PL) /
Dolní Marklovice (CS), to name a few. On 1 October 1938 Trans-Olza
was annexed by Poland following the
Munich Conference. On 1 September 1939 Zaolzie was annexed by
Nazi Germany after it
invaded Poland. During
World War II Cieszyn Silesia was a part of Nazi Germany. Immediately after the war, its borders were returned to their 1920 state. Poland signed a treaty with Czechoslovakia in Warsaw on 13 June 1958 confirming the border as it had existed on 1 January 1938. The Czech part of Cieszyn Silesia continued to be part of Czechoslovakia until the latter's dissolution in 1993 and since then has been part of the
Czech Republic. ==Geography==