"Leszek II the Black (c. 1241 – 30 September 1288), was a Polish prince of the House of Piast, Duke of Sieradz since 1261, Duke of ...
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Łęczyca since 1267, Duke of Inowrocław during 1273-1278, Duke of Sandomierz and High Duke of Poland since 1279." - (en.wikipedia.org 31.01.2020)
