Leszek II the Black
First mention of Opoczno comes from 1284, when Prince Leszek II the Black wrote in documents that the village belonged to the Sandomierz Collegiate church. According to historian F. Kiryk, the history of Opoczno as a town date from the mid-13th century, when it was granted town charter by Duke of Sandomierz, Bolesław V the Chaste. For unknown reason, Opoczno declined in the late 13th century, and turned into a village called "Staromieście" or "Old Opoczno".