Lestek (also Leszek, Lestko) is the second legendary duke of Poland, and son of Siemowit, born c. 870–880. Though proof of his actual existence is unclear, if he did exist, he must have been an influential person, because the tribes that lived in what is now 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 name Lścimir or Lścisław.
Lestek`s wife (or wives) is unknown. A theory by Stanisław Zakrzewski says that Lestek could be married to a Moravian princess. Another theory (inferred from the descriptions of a Belgian chronicler from the 14th century) says that a Saxon princess could have been Lestek`s wife (and they had a son Ewraker, later the Bishop of Leodium).
The only thing we know is that his son is Siemomysł, next ruler of early pagan Polish state.