Career
She was the twin sister of Catherine of Poděbrady, wife of Matthias Corvinus of Hungary. Sidonie and Catherine were born on 11 November 1449 to the Bohemian king. The girl"s mother, Kunigunde, died from complications of the birth.
The crown passed instead to Vladislaus II of Bohemia and Hungary.
A marriage contract was signed on 11 November 1459 for Sidonie"s marriage to Albert, son of Frederick II, Elector of Saxony.