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Its 12th century cathedral contains the tombs of Ladislaus Herman (died 1102) and Boleslaus III the Wrymouth (died 1138) - the dukes of Poland. Some historians say that Plock was the capital city of Poland during their reign (1080-1138).
This city 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.
The main industry is oil refining - the country's largest oil refinery is located there (it is served by a large pipeline leading from RussiaThe Russian Federation ( Russian: , transliteration: Rossiyskaya Federatsiya or Rossijskaja Federacija , or Russia (Russian: , transliteration: Rossiya or Rossija , is a country that stretches over a vast expanse of eastern Europe and northern Asia. With to GermanyThe Federal Republic of Germany ( German: Bundesrepublik Deutschland is one of the world's leading industrialized countries, located in the middle of the European Union. It is bordered to the north by the North Sea, Denmark and the Baltic Sea, to the east.
Members of Parliament ( SejmSejm or Seym (pronounced: []) is the name of lower house of Polish parliament. The history of the Sejm dates back to 1182 and the first Sejm at Leczyca. With time and develpment of unique Polish noble's democracy the Sejm powers increased. Since 1493 the) elected from Plock constituency