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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. He was the second son of Mieszko I, Duke of Cieszyn by his wife, probably called Grzymisława.
- 1280/90
- ?Grzymisława Vsevolodovna of Belz
- c. 29 September 1358
- Mieszko I, Duke of Cieszyn
Brief Life History of Kasimir I. 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
son Bolesław II. Casimir I (born July 25, 1016—died at latest Nov. 28, 1058) 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. Only surviving son of Duke Mieszko II and Richeza ...
- The Editors of Encyclopaedia Britannica
Casimir I may refer to: Casimir I of Poland (1016–1058), duke of Poland; Casimir I, Duke of Pomerania (after 1130 – 1180), duke of Pomerania-Demmin; Casimir I, Duke of Cieszyn (1280/90 – 1358)
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. He was the second son of Mieszko I, Duke of Cieszyn by his wife, probably called Grzymisława.
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. He was the second son of Mieszko I, Duke of Cieszyn by his wife, probably called Grzymisława.