Siemomysł

Siemomysł - (about 900~ to 950~) leader of Polan tribe, duke of Poland,  father of Mieszko I.

 How we know about him 
In the Gallus Anonymous Chronicle we can read about him as a Duke of Polans before Mieszko I. He is also mentioned in many other chronicles.

 What we know about him 
We do not know a lot about him. Perhaps he caused the wkrzanie uprising in Germany. He centralized the country a lot, beacause before baptism of Poland, this country was quite centralized as a Pagan country. He probably also conquered Goplans and Mazovians.

 Sources 
http://www.staropolska.pl/ang/middleages/Sec_prose/Gall.php3

Category:963 deaths
Category:890s births
Category:Kings of Poland
Category:Piast dynasty
Category:Polish dukes