Helena of Znojmo (; ; c. 1141âÂÂ1202/1206), was a Bohemian princess, a member of the Pà Âemyslid dynasty. She was the daughter of Duke Conrad II of Znojmo and his Serbian wife Maria (daughter of Uroà ¡ I). Helena was probably named after her maternal aunt, Queen Helena of Hungary, wife of King Béla II.
Born as princess of the Znojmo Appanage (named after its centre, the town of Znojmo in southern Moravia), she later became by marriage Duchess of Sandomierz (1173-1194), Grand Duchess of Kraków and the Seniorate Province (1177-1194), Duchess of Masovia (1186âÂÂ1194), and Duchess-regent of Kraków and the Seniorate Province, Sandomierz, and Masovia on behalf of her minor sons from 1194âÂÂ1198, then the latter two duchies plus Kuyavia until 1199/1200.
Helen married Casimir II the Just, youngest son of Bolesà Âaw III Wrymouth, probably shortly after his return from captivity, which at the latest was before 1161.
When Helen's husband Casimir II died on 1 May 1194, presumably as a result of a heart attack, he left her with their two minor sons on whose behalf she assumed the regency of Kraków and the Seniorate Province, Sandomierz, and Masovia with blessings from the Fulko, bishop of Kraków, and the Kraków voivode.
Helen's regency was not an easy one, because other princes threatened her minor sons. Their own uncle Mieszko III the Old was after Kraków and the Seniorate Province. This situation between Helen and Mieszko III lasted until the Battle of Mozgawàin September 1195, in which Mieszko III was seriously injured and his son Bolesà Âaw of Kuyavia was killed. In 1198, they reached an agreement: Mieszko would take Kraków, in return for which he gave Helen and her sons Kuyavia (they retained Masovia and Sandomierz). Independent authority over the inheritance was assumed by the eldest son, Leszek the White, in 1199 or 1200. Helen's intelligence and character were recorded in the chronicle of Vincent Kadlubek, who knew the princess in person. According to him Helen was "a woman with greater wisdom than usually women have".
Helen of Znojmo died between 1202 and 1206, probably on 2 April.
Helen and Casimir had the following children: