Bolesław III Wrymouth was a Polish prince born in 1086, known for his significant role in the history of Poland. He became the Duke of Masovia and later the Duke of Poland in 1107. His reign lasted until 1138, during which he worked to strengthen the Polish state and expand its territories. Bolesław III is particularly noted for his efforts to consolidate power among the fragmented regions of Poland. He implemented a system of inheritance that divided the country among his sons, which ultimately led to internal conflicts. His legacy includes both territorial expansion and the challenges of maintaining unity in a diverse realm.