Płock Cathedral (Polish: Katedra Płocka), or the Cathedral of the Blessed Virgin Mary of Masovia, is a Roman Catholic cathedral in the city of Płock, in central Poland. It is an example of 12th-century Romanesque architecture and is the oldest and most important historical monument in the city, which contains the tombs of several Polish monarchs. It is listed as a Historic Monument of Poland.
Płock (pronounced [pwɔt͡sk] ), officially the Ducal Capital City of Płock, is a city in central Poland, on the Vistula river, in the Masovian Voivodeship. According to the data provided by GUS on 31 December 2021, there were 116,962 inhabitants in the city.
Płock is a seat of the county (powiat) in the west of the Masovian Voivodeship. From 1079 to 1138 it was the capital of Poland. The Cathedral Hill (Wzgórze Tumskie), along with Płock Castle and the Catholic Cathedral containing the sarcophagi of some Polish monarchs, is listed as a Historic Monument of Poland. It was the main city and administrative center of Mazovia in the Middle Ages before the rise of Warsaw, and later it remained a royal city of Poland. It is the cultural, academic, scientific, administrative and transportation center of the west and north Masovian region. Płock is the seat of the Roman Catholic Diocese of Płock, one of the oldest dioceses in the country, founded in the 11th century, and it is also the global headquarters for the Mariavite Church. Poland's oldest school and largest oil refinery are located in Płock.