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Casimir I of Cieszyn (Polish: Kazimierz I cieszyński, Czech: Kazimír I. Těšínský, German: Kasimir I. von Teschen; 1280/90 – c. 29 September 1358), was Duke of Cieszyn from 1315, Duke of Siewierz from 1337 and Duke of Bytom from 1357.
- 1280/90
- ?Grzymisława Vsevolodovna of Belz
- c. 29 September 1358
- Mieszko I, Duke of Cieszyn
Apr 28, 2022 · Casimir I of Cieszyn (Polish: Kazimierz I cieszyński, Czech: Kazimír I. Těšínský, German: Kasimir I. von Teschen; 1280/90 – c. 29 September 1358), was Duke of Cieszyn from 1315, Duke of Siewierz from 1337 and Duke of Bytom from 1357.
- 1285
- Jenn Sedik
- April 28, 2022
When Kasimir I. Herzog von Teschen was born in 1280, in Katowice County, Silesia, Poland, his father, Mieszko Herzog von Teschen, was 28 and his mother, Grzymisława Duchess of Opole, was 19. He married Euphemia von Masowien before about 19 August 1324.
- Male
- Euphemia Von Masowien
Casimir I of Oświęcim ( Polish: Kazimierz I Oświęcimski) (1396 – 7 April 1434) was a Duke of Oświęcim since 1406 (under regency until 1414), ruler over Toszek (from 1414) and Strzelin (during 1416–1427). He was the only child of Duke Przemysław of Oświęcim by his unknown wife.
- 1396
- Anna of Żagań, Margareta of Opava-Ratibor
- 7 April 1434
- Silesian Piasts of Opole
Casimir I was the duke of Poland who reannexed the formerly Polish provinces of Silesia, Mazovia, and Pomerania (all now in Poland), which had been lost during his father’s reign, and restored the Polish central government.
- The Editors of Encyclopaedia Britannica
After his father's death circa 1315 and the subsequent division of the Duchy of Cieszyn, he received the south-western part, the former Cieszyn castellany, which from that time became the actual Duchy of Cieszyn, the basis of what was to become Cieszyn Silesia.
Casimir I of Cieszyn (Polish: Kazimierz I cieszyński, Czech: Kazimír I. Těšínský, German: Kasimir I. von Teschen; 1280/90 – c. 29 September 1358), was Duke of Cieszyn from 1315, Duke of Siewierz from 1337 and Duke of Bytom from 1357.
