 Complete the following phrase:  During the fragmentation period, both lands of Lesser Poland were frequently ruled by the same prince. Among them were Bolesław IV the Curly, Mieszko III the Old, Casimir II the Just, Leszek I the White, Bolesław V the Chaste, Leszek II the Black, Władysław I the Elbow-high, and King of Bohemia, Wenceslaus II of Bohemia, who united Lesser Poland in 12901291. The province was pillaged during the Mongol invasion of Poland, when a combined army of Kraków and Sandomierz was destroyed by Baidar in the Battle of Chmielnik. The loss was so heavy that Norman Davies wrote: At Chmielnik, the assembled nobility of Małopolska perished to a man. During their 