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|Duchy of Masovia
Mazouse (Mazovian) or Księstwo Mazowieckie (pl)
|Province of Poland
Fiefdom of the Polish Crown (from 1351)
Coat of arms
Czersk (from 1262)
Warsaw (from 1413)
|- 1138–1173||Bolesław the Curly|
|- 1194–1247||Konrad I|
|- 1248–1262||Siemowit I|
|- 1503–1526||Janusz III (last)|
|Historical era||Middle Ages|
|- Split off Kuyavia||1233|
| - Vassalized by the
|- Second partiton||1381|
| - Incorporated by
The Duchy of Masovia (Polish: Księstwo Mazowieckie) 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.
Among the Piast Dukes of Masovia, Bolesław's IV nephew Konrad I was High Duke from 1229 to 1232 and again from 1241 to 1243; he was the ruler who called the Teutonic Knights for help against the pagan Old Prussians threatening the northern borders of his territory. In turn he ceded the Prussian Kulmerland to the Knights in 1230, which according to the 1235 Golden Bull of Rimini (dated 1226) issued by Emperor Frederick II of Hohenstaufen became the nucleus of the Order State. In 1233 Konrad gave Kuyavia to his second son Casimir I, while Masovia passed to the first-born Boleslaus I upon his death in 1247, succeeded by the youngest brother Siemowit I the next year.
While Siemowit's son Duke Konrad II (1264–1294) moved his residence to Czersk he and his brother Boleslaus II entered into a long-term conflict over the Polish seniorate with their Kuyavian relatives and the Silesian Piasts, which estranged them from the Piast monarchy. When the kingdom was finally restored in 1295 by the coronation of Duke Przemysł II of Greater Poland, the Duchy of Masovia remained independent.
Upon the death of Duke Boleslaus II in 1313, Masovia was divided among his sons:
Trojden's son Duke Siemowit III (1341–1381) was able to re-unite most of the Masovian lands under his rule; in 1351 he and his brother Casimir became vassals of the Polish kings, while the Bishopric of Płock had always been part of the Polish Archdiocese of Gniezno. Upon Siemowit's III death in 1381 however, Masovia was again partitioned between his sons:
After the establishment of the Rawa and Płock Voivodeships, in 1495 the last surviving son of Boleslaus IV, Duke Konrad III Rudy, once again united the remaining Masovian lands under his rule. However, the male line of the Masovian Piasts became extinct upon the death of his son Janusz III, in 1526, whereafter the duchy became the Masovian Voivodeship of the Kingdom of Poland.
Parts of the southern region of neighboring East Prussia received settlers and Protestant religious refugees who became known as the Mazurs. By the 18th century the portion of East Prussia in which they settled was sometimes referred to as Masuria (Masuren), and inhabited by a Protestant population of Germans and Poles.
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