Background
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.
duke of Saxony Duke of Pomerania
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.
After the lost 1164 Battle of Verchen, where Casimir and Bogislaw aided an Obodrite rebellion against the duke of Saxony, Henry the Lion, Casimir and Bogislaw joined Saxony receiving their respective part duchies as a fief from Henry the Lion. Casimir also received one third of the Danish terra Wolgast. When Saxony allied with the Danes to subdue the Rani kingdom of Rügeneral in 1168, Casimir as well as Bogislaw aided Henry.
Casimir also managed to take control in Circipania, thereby expanding Pomerania to the West.
Casimir participated in other campaigns launched by Henry the Lion, as an 1178/79/80 expedition into Lusatia and Jüterbog. Casimir founded monasteries in Broda (1170) and Belbuck (1177).
He participated in founding the monastery Dargun (1172/74) and in 1176/80 granted privileges to the bishopric of Wollin that moved its seat to Cammin (now Kamień Pomorski) because of Danish expeditions.