Bolesław, Prince of Krakow and Sandomierz, charters Krakow according to the Magdeburg Law, Kopernia, 5th June 1257. The Municipal Charter of the City of Krakow of 5th June 1257 laid the foundation for the development of the municipal self-government (ANK, Zbiór dokumentów pergaminowych, sygn. Perg. 2)