Bolesław IV the Curly (c. 1122-1173): The Architect of Polish Fragmentation Bolesław IV Kędzierzawy, a figure shrouded in legend and overshadowed by his father’s monumental reign, nevertheless stands as a pivotal point in Polish history—a ruler whose ambition ultimately fractured the kingdom into warring factions for nearly two centuries. Born around 1122 in Kraków, he ascended to the dukedom of Masovia following the untimely deaths o…