Mieszko III the Old
Little is known about the early years of Casimir's life, except for his own birth, which was the pretext for an agreement between his father and Casimir II the Just, who since 1177 ruled as High Duke of Poland having deposed his elder brother Mieszko III the Old. Casimir II aimed to break the long-time alliance of Mieszko I Tanglefoot with his uncle Mieszko III the Old and in return granted to the Racibórz duke the Lesser Polish districts of Bytom, Oświęcim and Pszczyna as a gift. After the birth of Mieszko Tanglefoot's son and heir, Casimir II the Just stood as the child's godfather who was also named after him.