He either was a son of Bogislaw I and Walburga of Denmark , or Wartislaw of the Swantiboride sideline of the Griffins , castellan of Szczecin .
Wartislaw II ( * ~ 1160 -- ~ 1184 ) was a duke of Pomerania - Demmin .
Wartislaw II either was a duke of Bogislaw I and Walburga of Denmark , or Wartislaw of the Swantiboride sideline of the Griffins , castellan of Szczecin .
Wartislaw II ( * ~ 1160 -- ~ 1184 ) was a duke of Pomerania - Demmin .