"Bolesław III Wrymouth (also known as Boleslaus III the Wry-mouthed, Polish: Bolesław III Krzywousty) (20 August 1086 – 28 October 1138), was a Duke of Lesser Poland, Silesia and Sandomierz between 1102 and 1107 and over the whole Poland between 1107 and 1138. He was the only child of Prince Władysław I Herman and his first wife Judith, daughter of Vratislaus II of Bohemia.
Bolesław began to rule in the last decade of the 11th century, when the central government in Poland was significantly weakened. Władysław I Herman fell under the political dependence of the Count palatine Sieciech, who became the real ruler of the country. Backed by their father, Boleslaw and his half-brother Zbigniew finally expelled Sieciech from the country in 1101, after several years of fighting. After the death of Władysław I Herman in 1102, two independent states were created ruled by Bolesław and Zbigniew." - (en.wikipedia.org 31.01.2020)
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