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About Casimir I, Duke of Pomerania
Casimir I was duke of Pomerania since his uncle Ratibor I's death in 1155/56. A son of Wartislaw I, he co-ruled Pomerania with his older brother Bogislaw I, receiving Pomerania-Demmin as his share just as Bogislaw received Pomerania-Stettin, and ruling the remainder in common.
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