Płock is a city in central Poland, on the Vistula river, with 131,011 inhabitants. It is located in the Masovian Voivodeship (since 1999), having previously been the capital of the Płock Voivodeship (1975-1998). It now heads a Powiat (province) at the extreme west of the Mazovian Voivodeship.
Its 12th century beautiful cathedral contains the tombs of Ladislaus Herman (died 1102) and Boleslaus III the Wrymouth (died 1138) - the dukes of Poland. They are buried in the Masovian Blessed Virgin Mary Cathedral in Płock. Płock was the capital city of Poland during their reign (1079-1138). It was also a seat of several of the Dukes of Masovia and one of the capitals of that state.
This site is the main seat of the Mariavite bishops. Their most important church was built here in the beginning of 20th century - it is called Temple of Mercy and Charity and is situated in a pleasant garden on the hill on which the historical centre of Płock is built, near the Vistula river.
The main industry is oil refining. The country's largest oil refinery, (Plock refinery) and parent company, PKN Orlen is located there; it is served by a large pipeline leading from Russia to Germany. There are several industrial activities connected with the refinery, such as servicing and construction. There is also a factory producing for Levi Strauss & Co.
Bus service covers the entire city, with 39 routes.