 However, a re-establishment of the Polish kingdom under the rule of the Silesian Piasts failed, when Duke Henry's I son Henry II the Pious was killed during the Mongol invasion at the 1241 Battle of Legnica.After an interregnum he was succeeded by Leszek's I son Bolesław V the Chaste, who upon his death in 1279 appointed Konrad's grandson Leszek II the Black of Kuyavia.The Silesian Piasts once again reached for the Senioral Province, when Leszek II died without heirs in 1288, and Duke Henry IV Probus of Wrocław became High Duke at Kraków but likewise had no issue upon his death in 1290.