"Sidonie of Poděbrady (Czech: Zdenka z Poděbrad; 11 November 1449 – 1 February 1510) was a duchess consort of Saxony. She was a daughter of George ...
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of Poděbrady, King of Bohemia, and his first wife Kunigunde of Sternberg. She was the twin sister of Catherine of Poděbrady, wife of Matthias Corvinus of Hungary." - (en.wikipedia.org 29.12.2019)