 At any rate, chronicler Gallus Anonymus in his "Gesta principum Polonorum" calls the Griffins "close cousins" of then-contemporary Bolesław III of Poland, directly implying a close dynastic relationship with the Piasts.In the 17th century, the Griffins derived their roots from legendary beings from Sorb mythology called "Gryphus" or "Baltus".The first known members of the Griffins were the brothers Wartislaw I and Ratibor I. Wartislaw would be the ancestor of the line of dukes that ruled the Duchy of Pomerania until 1630; Ratibor would be the ancestor of the Ratiborides branch of the Griffins, that was to rule the lands of Schlawe and Stolp until the line became extinct and the area was incorporated in the Duchy of Pomerania.