Question: What is the date of birth of Mieszko Iii The Old's father?
Sentence (from "Bolesław III Wrymouth"): Bolesław III Wrymouth (also known as Boleslaus III the Wry-mouthed) (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.
Relevant evidence: Yes