Duchy of Masovia
| Duchy of Masovia | ||||||||||
| Księstwo Mazowieckie | ||||||||||
| Province of Poland Fiefdom of the Polish Crown (from 1351) |
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 Masovian lands (ziemie)
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| Capital |
Płock Czersk (from 1262) Warsaw (from 1413) |
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| Religion | Roman Catholic | |||||||||
| Government | Duchy | |||||||||
| 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 | ||||||||
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Coat of arms
The Duchy of Masovia (Polish: Księstwo Mazowieckie; Mazovian: Xjãstfo Mazovii) with its capital at Płock was a medieval duchy formed when the Polish Kingdom of the Piasts fragmented in 1138. It was located in the historic Masovian region of northeastern Poland. Masovia was reincorporated into the Jagiellon Polish kingdom in 1526.
The lands of the Masovians east of the Vistula river had been conquered by Duke Mieszko I of Poland (960–992) and formed a constituent part of the Civitas Schinesghe under the Piast dynasty. The Diocese of Płock had been established in 1075.
Following the death of Duke Bolesław III Wrymouth in 1138, as specified by his testament, the Masovian province was governed by his second son Bolesław IV the Curly, who, after he had expelled his elder half-brother Władysław II, in 1146 became Grand Prince (High Duke) of Poland. His Masovian realm also comprised the adjacent lands of Kuyavia in the west.
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Wikipedia