Mieszko I, Duke of Cieszyn

Mieszko cieszyński – od 1281/2 wspólnie z bratem Przemysławem w Cieszynie, Oświęcimiu i Raciborzu, od 1290 po podziale samodzielny książę cieszyńsko-oświęcimski. Założyciel linii Piastów cieszyńskich. Wikipedia PL

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https://en.wikipedia.org/wiki/Mieszko_I,_Duke_of_Cieszyn

Mieszko I Mieszko I Cieszyński seal 1288.PNG Mieszko I's seal, dated to 1288. Born 1252/56 Died 27 June 1315 Noble family Silesian Piasts of Opole Spouse(s) ?Grzymisława Vsevolodovna of Belz Issue Władysław Casimir I Viola Elisabeth of Cieszyn Father Władysław Opolski Mother Euphemia of Greater Poland

Marriage and issue According to some sources,[1] Mieszko's wife died around 1303, but her name is unknown. The Obituary of the Church of St. Vincent in Wrocław showed the existence of a certain "Grzymisława, Duchess of Opole" (Grimizlaua ducissa Opuliensis) who was buried there around 13 September 1286.[2] Her parentage is also unknown, but her name suggests a Russian origin, probably member of the Rurikids.[3] Her title suggests that she may have been the wife of Mieszko I or the first wife of Bolko I (Mieszko I's brother), or maybe a completely different person.

Also, the exact date of their marriage was uncertain, but after a further reconstructions of their children's birth dates, was placed between 1275 and 1280. They had three children:[4]

Władysław (born 1275/80 – d. by 15 May 1324) Casimir I (born 1280/90 – d. by 29 September 1358) Viola Elisabeth (born ca. 1291 – d. 21 September 1317), married on 5 October 1305 to King Wenceslaus III of Bohemia __________________________________________________________

http://fmg.ac/Projects/MedLands/SILESIA.htm _______________________________________________