title: Casimir I
text: # Casimir I
  
  Casimir I may refer to:
  
  * Casimir I of Poland (1016–1058), duke of Poland
  * Casimir I, Duke of Pomerania (after 1130 – 1180), duke of Pomerania-Demmin
  * Casimir I, Duke of Cieszyn (1280/90 – 1358)
  