Lestek [SEP] father
Lestek
Lestek (also Leszek, Lestko) was the second duke of Poland, and son of Siemowit, born c. 870–880. Although proof of his actual existence is unclear, if he did exist, he must have been an influential person, because the tribes that lived in present-day Poland were known as Lestkowici. 
The origin of his name is not known, it can be derived from the old Polish word "lście" which means "crafty". It is believed this is a diminutive of the Slavic
Mieszko I of Poland
Mieszko I (; – 25 May 992) was the ruler of Poland from about 960 until his death. A member of the Piast dynasty, he was a son of Siemomysł, and a grandson of Lestek. He was the father of Bolesław I the Brave (the first crowned king of Poland) and of Gunhild of Wenden. Most sources make Mieszko I the father of Sigrid the Haughty, a Scandinavian queen, though one source identifies her father as Skoglar Toste, and the grandfather of Canute