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Mazovia
 (msymbolzō´vēsymbol) or Masovia  (msymbolsō´—) Pol. Mazowsze, historic region, central Poland. At the death (1138) of Boleslaus III, Mazovia became an independent duchy under the Piast dynasty. It became a suzerainty of Great Poland in 1351 and was finally united with it in 1526. Mazovia passed to Prussia during the 18th-century partitions of Poland and was later a part of the Russian Empire. It reverted to Poland in 1918.