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 in the years 1273-1278, Duke of Sandomierz and High Duke of Poland from 1279 until his death.
Leszek's seal
The House of Piast was the first historical ruling dynasty of Poland. The first documented Polish monarch was Duke Mieszko I. The Piasts' royal rule in Poland ended in 1370 with the death of King Casimir III the Great.
Deeds of the Princes of the Poles
Image: Mieszko Dagome
Image: Chrobry 1
Image: Mieszko II