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In page Judith of Poland:

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Judith was the daughter of Duke Bolesław III Wrymouth of Poland by his second wife, Salomea of Berg. She was probably named after either her paternal grandmother, Judith of Bohemia, or her older half-sister, the princess of Murom.[1] Judith was one of the youngest children of her parents; her date of birth remains unknown. According to Polish medieval chronicles, she was sent to Hungary as a bride of the son of King Béla II.[citation needed] According to the Annales Cracovienses Compilati, this event took place in 1136; since it can be assumed that the Polish princess was younger than her betrothed, and also are known the birth dates of the youngest children of Bolesław III (Agnes in 1137 and Casimir in 1138), Judith in consequence could have been born between 1130 and 1135.