Leszek II the Black
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Leszek II the Black was a Polish prince of the House of Piast, Duke of Sieradz since 1261, Duke of Łęczyca since 1267, Duke of Inowrocław from 1273 to 1278, Duke of Sandomierz and High Duke of Poland
Seal featuring Leszek the Black kneeling before Saint Stanislaus, 1281–1288
Bolesław V the Chaste
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Bolesław V the Chaste was Duke of Sandomierz in Lesser Poland from 1232 and High Duke of Poland from 1243 until his death, as the last male representative of the Lesser Polish branch of Piasts.
Leszek II the Black
…because the local nobility, dissatisfied with their adventurous policy, retired their support; however, thanks to the help of a coalition formed with Bolesław V the Chaste, Siemowit I of Masovia, and Bolesław the Pious, Leszek eventually forced his father to give him the district of Sieradz as a separate duchy. Leszek's…
Bolesław's effigy on a seal
Bolesław Wstydliwy (1893) by Jan Matejko
A 14th century depiction of the Battle at Legnica against the Mongols.
Battle of Kressenbrunn (1260) during which Bolesław aided the Hungarians under Béla IV against Ottokar II of Bohemia.