Płock is also a historical capital of Mazovia (region of Poland), being oldest town this region (town rights in 1237), former residence of Mazovian princes and the oldest in Mazovia legislated seat of the diocese in 1075 with the Cathedral in Płock built in the first half of the 12th century in which the royal chapel is situated together with the sarcophagus of Polish monarchs.
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Formerly, in the period of the rule of the first monarchs of Piast State, like also before Baptism of Poland in 966, in the 10th century Płock as the capital castle were one of monarchal seats, among others of prince Mieszko I and of king Bolesław I Chrobry, which on the Płock Tumskie Hill over the Vistula River raised one's palatium.
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