Duchy of Greater Poland

According to the statute, constitution or last will of the Polish duke Boleslaus the Wrymouth Poland was divided into the 4-5 hereditary provinces distributed among his sons, and a royal province of Cracow for the eldest to be the high-duke of all Poland.

One of these provinces, Greater Poland was given to the Mieszko III the Old the third oldest son of Boleslaus, and subsequenly divided among his decendants and successors, until they died out in 1296