Soběslav I was Duke of Bohemia from 1125 until his death in 1140. He was a member of the Přemyslid dynasty, the youngest son of Vratislaus II, by his third wife Świętosława of Poland. Wikipedia
Born: 1090, Prague, Czechia
Died: February 14, 1140 (age 50 years), Hostinné, Czechia
Children: Soběslav II, Duke of Bohemia, Oldřich of Olomouc, Wenceslaus II, Duke of Bohemia, and more
Great-grandparents: Oldřich, Duke of Bohemia, Mieszko II Lambert, Vladimir the Great, and more
Grandchild: Gertrude of Baden
Partner: Adelaide of Hungary (1123–)
Parents: Vratislaus II of Bohemia and Świętosława of Poland