SECUREen.wikipedia.org/wiki/Duchy_of_Pomerania
The Duchy of Pomerania (German: Herzogtum Pommern, Polish: Księstwo Pomorskie) was a duchy in Pomerania on the southern coast of the Baltic Sea, ruled by dukes of the House of Pomerania (Griffins).The country had existed in the Middle Ages, in years 1121–1160, 1264–1295, 1478–1531 and 1625–1637. The duchy originated from the realm of Wartislaw I, a …