Duke of Masovia
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The Dukes of Masovia were a line of the Piast dynasty who ruled in Masovia. The following is a list of all rulers of the Duchy of Masovia and its parts. Although not all incumbents listed here had titular rights to the title of Duke of Masovia, they are all listed as such for simplicity's sake.
Also take note that some of the dates are merely approximate and the ownership of certain lands might be disputed. Finally, this table does not include lands ruled by dukes of other parts of partitioned Poland or Wenceslaus II and Wenceslaus III.
| Term | Incumbent | Notes |
|---|---|---|
| "Masław's state" | ||
| ca.1037 to 1047 | Miecław | The cup-bearer of Mieszko II who tried to establish his own state in Masovia, defeated by Casimir I |
| Duchy of Masovia-Kuyavia | ||
| 1138 to 1173 | Bolesław IV the Curly | son of Boleslaus III of Poland |
| 1173 to 1186 | Leszek | son of Boleslaus IV |
| 1186 to 1194 | Casimir II | (the Just), son of Boleslaus III of Poland |
| 1194 to 1200 | Leszek I the White | (the Pale), co-regent with his brother listed below |
| 1194 to 1247 | Konrad I | |
| 1194 to 1200 | Helen of Znojmo | ♀, regent, died in 1206 |
| Duchy of Masovia (Płock) | ||
| 1229 to 1248 | Bolesław I | son of Konrad I |
| 1247 to 1262 | Siemowit I | brother of Bolesław I |
| 1262 to 1264 | Prejeslawa | ♀, widow, ruled as a regent |
| Duchy of Czersk | ||
| 1264 to 1294 | Konrad II | |
| Duchy of Masovia | ||
| 1262 to 1313 | Bolesław II | united, and then divided the duchy among his sons |
| Duchy of Rawa | ||
| 1310 to 1345 | Siemowit II | one of the sons, after his death the duchy divided among the nephews of Trojden I |
| Duchy of Czersk and Warsaw | ||
| 1310 to 1341 | Trojden I | |
| 1341 to 1355 | Casimir I | since 1351 a vassal of Poland; after his death in 1355 the land reunited with the rest of Masovia |
| Duchy of Płock | ||
| 1313 to 1336 | Wacław I | son of Bolesław II, after 1329 vassal of Bohemia |
| 1336 to 1351 | Bolesław III | until 1340 his fiefdom ruled by regents; vassal of Bohemia, after his death in 1351 his lands divided between the other dukes of Masovia and Poland |
| Duchy of Halicz | ||
| 1323 to 1340 | Bolesław Jerzy II | son of Trojden I, between his death in 1340 and 1366 Duchy of Halicz is gradually annexed by Poland |
| Duchy of Masovia | ||
| 1341 to 1381 | Siemowit III | brother of Casimir I, duke in Warsaw and Czersk; until 1370 managed to reunite much of the Masovian domain including Płock, but in 1374 divided it between his sons |
| Duchy of Płock | ||
| 1374 to 1426 | Siemowit IV | son of Siemowit III, since 1386 hereditary vassal of Poland, after 1382 lost much of his domain to Teutonic Order (Bełz, Wizna, Zawkrze, Płońsk) |
| 1426 to 1427 | Trojden II | son of Siemowit III, co-regent. |
| Duchy of Rawa | ||
| 1426 to 1442 | Siemowit V | son of Siemowit V |
| 1442 to 1459 | Margareth of Raciborz | ♀, received the town of Gostynin as her dowry while the rest of the domain was joined with Płock |
| Duchy of Bełz | ||
| 1426 to 1442 | Casimir II | son of Siemowit IV, until 1434 a co-regent (with brothers), after his death Bełz joined with Płock |
| United Duchy of Płock | ||
| 1426 to 1455 | Władysław I | son of Siemowit IV |
| 1455 to 1481 | Ann of Olesnica | ♀, widow of Władysław I, received Sochaczew, Koło and Mszczonów as her dowry |
| 1455 to 1461/1462 | Siemowit VI and Władysław II | sons of Władysław I, since 1459 only in Gostynin |
| around 1462 | Paul of Gizycko | bishop of Płock, as regent; after 1462 Gostynin, Rawa and Bełz to Poland while Płock, Płońsk, Wizna and Zawkrze to Duchy of Warsaw |
| Duchy of Warsaw | ||
| 1373 to 1429 | Janusz I | son of Siemowit III, since 1386 hereditary vassal of Poland, after 1391 Duke of Podlasie |
| 1429 to 1454 | Bolesław IV | until 1436 regency of his mother, Ann of Kiev, between 1440 and 1444 only as Duke of Podlasie |
| 1454 to 1462 | Siemowit VI | |
| around 1462 | Barbara Ruska (♀) and Paul of Gizycko | co-regents: widow of Bolesław IV and bishop of Płock |
| Duchy of Płock | ||
| 1454 to 1475 | Casimir III | son of Bolesław IV, until 1471 co-regent (with brothers), after 1471 as administrator of the land (belonging to the bishops), abdicated in 1475 but ruled until 1480 as bishop of Płock |
| 1471 to 1495 | Janusz II | brother of Casimir III, ruled in Ciechanów and Łomża, after his brothers' abdication also titular ruler of Płock, Płońsk, Wizna, Zawkrze, after 1485 also Błonie, Kamieniec and Wyszogród; after his death the duchy annexed by Poland |
| Duchy of Warsaw | ||
| 1471 to 1488 | Bolesław V | son of Bolesław IV, after his death his domain rejoined with the remaining part of Masovia |
| Duchy of Masovia | ||
| 1454 to 1503 | Konrad III Rudy | (the Red), son of Bolesław IV, reunited most of Masovia still not controlled by Poland, including Płock, Płońsk, Czersk, Wyszogród and Warsaw |
| 1503 to 1524/1526 | Stanisław I and Janusz III | sons of Konrad III Rudy, until 1518 regency of their mother Anna Radziwiłł, then co-regents (until Stanisław's death in 1524); in 1526 Masovia annexed by Poland |
