[2] In the 9th century, the Polans united several West Slavic (Lechitic) groups to the north of Great Moravia.The union led by the Piast dynasty developed into the Duchy of Poland, whose name derives from that of the Polans.[3] The earliest Polan rulers mentioned by name are the legendary figures of Piast the Wheelwright and Popiel (8th–9th centuries).[4] The Dagome iudex document refers to Poland during Mieszko's reign as Civitas Schinesghe (The Gniezno State).The document describes the country as stretching between the Oder and Rus and between Lesser Poland ("Craccoa"/"Alemure") and the Baltic Sea.