Henryk IV Probus
In the Middle Ages both Jelcz and Laskowice were part of the Kingdom of Poland ruled by the Piast dynasty. The first known mentions of both villages come from the 13th century, although they probably already existed in the 12th century. Laskowice was first mentioned in 1203, when it was granted by Duke Henry the Bearded to Polish noble Leonard Włostowic, the grandson of Piotr Włostowic. Jelcz was first mentioned as "Jalche" in a 1245 deed, when Pope Innocent IV assigned it to the Archdiocese of Wrocław. In 1277 Duke Bolesław II the Bald of Legnica here captured and arrested his nephew Duke Henryk IV Probus of Wrocław. Bolesław's grandson, Duke Bolesław III the Generous had a castle erected on an island in the Oder river about 1331. The village of Laskowice, on the other hand, was reestablished in 1293 in a slightly different location by Duke Henry V.