"Bolesław II is considered to have been one of the most capable of the Piast rulers. In 1075 he re-established the Archdiocese of Gniezno (consecrated in ...
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1064) and founded the Diocese of Płock. He established Benedictine monasteries in Mogilno, Lubin and Wrocław. Bolesław II was also the first Polish monarch to produce his own coinage in quantity great enough to replace the foreign coins prevalent in the country during the reigns of the first Piast kings. He established royal mints in Kraków and Wrocław and reformed the coinage, which brought considerable revenue into the royal coffers. All these efforts had an enormous influence on the economic and cultural development of the country." - (en.wikipedia.org 31.01.2020)
