Duchy of Masovia

Duchy of Masovia
Księstwo Mazowieckie (Polish)
Ducatus Mazouie (Latin)
1138–1275
1294–1310
1370–1381
1495–1526
Flag of Mazovia
Banner
of Mazovia
Coat of arms
Masovian lands
Masovian lands
StatusFiefdom of Kingdom of Poland (1025–1385)
Fiefdom of Kingdom of Poland (1385–1569)
CapitalPłock
Czersk (from 1262)
Warsaw (from 1413)
Religion
Roman Catholic
GovernmentDistrict principality
Dukes 
• 1138–1173
Bolesław the Curly
• 1194–1247
Konrad I
• 1248–1262
Siemowit I
• 1503–1526
Janusz III (last)
Historical eraMiddle Ages
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

The 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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  1. ^ Rutkowski, Henryk (2018). "A Few Comments on the Historical Borders in Poland". Studia Geohistorica (6): 124–135. ISSN 2300-2875.
  2. ^ M., I. A. (1952). "Review of Eighth Miscellany Volume". The English Historical Review. 67 (264): 435–437. ISSN 0013-8266. JSTOR 554895.
  3. ^ Minakowski, Marek Jerzy; Smoczynski, Rafal (2019-08-01). "Mapping Homogamy of Noble Descendants in Poland. A Case Study of the Genealogy of Descendants of the Great Sejm". Acta Universitatis Sapientiae, Social Analysis. 9 (1): 29–52. doi:10.2478/aussoc-2019-0003. S2CID 201728710.
  4. ^ Ptaszyński, Maciej (2015-01-01). The Polish-Lithuanian Commonwealth. Brill. ISBN 978-90-04-30162-7.