 Duke Wartislaw I (died 1135) was the first historical ruler of the Duchy of Pomerania and the founder of the Griffin dynasty.The most prominent Griffin was Eric of Pomerania, who became king of the Kalmar Union in 1397, thus ruling Denmark, Sweden and Norway.The last Griffin duke of Pomerania was Bogislaw XIV, who died during the Thirty Years' War, which led to the division of Pomerania between Brandenburg-Prussia and Sweden.