Henryk IV Probus
After the 1252 discovery of large salt and potassium deposits across southern Poland, the extraction of salt began on a much broader scale. In the year 1289, Henryk IV Probus, then Lord of Kraków, issued a document authorising brothers Jescho and Isenbold to expand the town. Duke and future king Premislaus II granted Wieliczka town privileges in 1290.