Mieszko Bolesławowic was facilitated by a deal between Ladislaus I of Hungary and Władysław I Herman. Another version, publicized by a Hungarian chronicler, claims that in 1086 Ladislaus I of Hungary invaded the Kingdom of Poland, took control of Cracow, and installed Mieszko as its ruler. Though there is no direct primary source evidence for this, notes in Cracow almanacs strongly suggest that during the years 1086 - 1089 Mieszko was prince of Cracow. However, sometime during this time he accepted over-lordship of his uncle Wladyslaw I Herman, and gave up his hereditary claim to the crown of Poland in exchange for
Mieszko I, Duke of Cieszyn was on 1 January 1290. In internal politics he pursued vigorous policies. Mieszko carried out intensive colonizing policies and founded many settlements. He also gave city rights to several towns: Cieszyn, Oświęcim (in 1291), Bielsko, Skoczów and Fryštát. On 10 November 1292 he granted the city rights to Zator. Mieszko refused to support any of the Piast pretenders to the Polish throne (Henry IV Probus, Przemysł II and Władysław I the Elbow-high). Instead he stood alongside King Wenceslaus II of Bohemia. On 17 January 1291 the formal agreement was signed in Olomouc which formed the alliance between the Bohemian Kingdom,