Duchy of Masovia

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Duchy of Masovia Księstwo Mazowieckie (Polish) Ducatus Mazouie (Latin)
1138–1275 1294–1310 1370–1381 1495–1526
Banner Coat of arms
Masovian lands
Status	Fiefdom of Kingdom of Poland (1025–1385) Fiefdom of Kingdom of Poland (1385–1569)
Capital	Płock Czersk (from 1262) Warsaw (from 1413)
Religion	Roman Catholic
Government	District principality
Dukes
• 1138–1173	Bolesław the Curly
• 1194–1247	Konrad I
• 1248–1262	Siemowit I
• 1503–1526	Janusz III (last)
Historical era	Middle Ages
• Established	1138
• Split off Kuyavia	1233
• Partitioned	1313
• Vassalized by the Polish Crown	1351
• Second partition	1381
• Incorporated by Poland	1526
Preceded by Succeeded by Kingdom of Poland Duchy of Płock Duchy of Warsaw Duchy of Czersk Duchy of Rawa Kingdom of Poland Duchy of Kuyavia Duchy of Dobrzyń Duchy of Płock Duchy of Warsaw Duchy of Wizna Duchy of Czersk Duchy of Belz Duchy of Rawa

Duchy of Masovia^[a] was a district principality and a fiefdom of the Kingdom of Poland, existing during the Middle Ages.^[1][2] The state was centered in Mazovia in the northeastern Kingdom of Poland, and during its existence, its capital was located in the Płock, Czersk and Warsaw. It was formed in 1138 from the territories of the Kingdom of Poland, following its fragmentation, that was started by the testament of Bolesław III Wrymouth. The country existed in the years: 1138–1275, 1294–1310, 1370–1381, and 1495–1526, between that time, going through fragmentations of its territory into smaller duchies and its unification. The states formed during its fragmentation were duchies of Kuyavia, Dobrzyń, Czersk, Płock, Warsaw, Rawa and Belz. In 1526, the country was incorporated into the Kingdom of Poland.^[3][4]

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