sentences:  The Germans renamed the city Schröttersburg in 1941 after the former Prussian Baron of the Empire Friedrich Leopold von Schrötter.The Museum of Mazovia provides exhibits and interpretation of the city and region's history.Płock is the oldest legislated seat of the Roman Catholic diocese; the Masovian Blessed Virgin Mary Cathedral was built here in the first half of the 12th century and houses the sarcophagi of Polish monarchs.