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It was probably first used by Dobrawa, the wife of Mieszko I, and her Bohemian attendants – Mieszko himself was baptised in 966 (see Baptism of Poland).
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.
Some have suggested that the use of water is an allusion to the baptism of Mieszko I, the Duke of Polans (c. 935–992) in 966 AD, uniting all of Poland under the banner of Christianity.