George of Poděbrady
Catherine and her twin sister Sidonie were born at Poděbrady, to the Bohemian king George of Poděbrady and his first wife, Kunigunde of Šternberk. Kunigunde died from complications of the birth. George of Poděbrady eventually remarried; his second wife, Joanna of Rožmitál, bore George more children, including Ludmila of Poděbrady.