Duke of Masovia

Duke of Masovia (Polish: Książę Mazowsza) was a title born by the sons and descendants of the Polish Duke Bolesław III Wrymouth. In accordance with the last will and testament of Bolesław, upon his death his lands were divided into four to five hereditary provinces distributed among his sons, and a royal province of Kraków reserved for the eldest, who was to be High Duke of all Poland. This was known as the fragmentation of Poland. Subsequent developments lead to further splintering of the duchies.

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.

Duchy of Masovia

Partitions of Masovia

The Duchy went through various border changes in the coming years, sometimes losing and sometimes gaining territory.

1138–1275 Duchy of Masovia
1275–1294 Duchy of Czersk Duchy of Płock
1294-1310 Duchy of Masovia
1310-1313 Duchy of Czersk Duchy of Masovia
1313-1345 Duchy of Warsaw Duchy of Rawa Duchy of Płock
1345-1349 Duchy of Warsaw-Rawa
1349-1351 Duchy of Warsaw Duchy of Rawa
1351-1355 Annexed to Poland
1355-1370 Duchy of Warsaw-Rawa
1370-1381 Duchy of Masovia
1381-1434 Duchy of Warsaw Duchy of Płock-Rawa
1434-1442/59 Duchy of Rawa Duchy of Płock Duchy of Bełz
1442/59-1462 Duchy of Płock-Rawa
1462-1471 Duchy of Masovia
1471-1488 Duchy of Czersk Duchy of Warsaw Duchy of Płock
1488-1495 Duchy of Czersk-Warsaw
1495-1526 Duchy of Masovia

Dukes of Masovia

Piast Dynasty

RulerBornReignDeathRuling PartConsortNotes
Boleslaus (I) the Curly11251138-11735 January 1173MasoviaViacheslava Vsevolodovna of Novgorod
three children

after 1160
no children
Son of Bolesław III Wrymouth of Poland. Also Duke of Silesia and monarch of Poland.
Leszek I11621173-11861186MasoviaUnmarriedSon of Bolesław the Curly.
Casimir (II) the Just11381186-11945 May 1194Masovia 1163
seven children
Son of Bolesław III Wrymouth of Poland. Also monarch of Poland.
Helena of Moravia-Znojmo (regent)1141 1194-12001202/6MasoviaRegent on behalf of her son.
Leszek II the White1184/524 November 1227MasoviaGrimislava Ingvarevna of Lutsk
between 1208 and 1211
three children
Son of Casimir the Just. Also monarch of Poland, after his abdication of Masovia to his brother Conrad, in 1200, shortly after reaching majority.
Conrad I1187/81200-124731 August 1247MasoviaAgafia Yaroslavna of Peremyshl
between 1207 and 1210
ten children
Son of Casimir the Just. Also monarch of Poland.
Boleslaus I12081247-124825 February 1248MasoviaGertrude of Lower Silesia
no children

Anastasia Alexandrovna of Belz
between 1245 and July 1247
no children
Son of Conrad I. Died without descendants.
Siemowit I1224/81248-126223 June 1262Masovia 1248
three children
Brother of Bolesław I. Killed in a battle against the Lithuanians, who also took his heir prisoner.
Pereyaslava Danilovna of Halych (regent)Before 1248 1262-126412 April 1283Masovia Regents during Conrad's captivity in Lithuania.
Boleslaus, Duke of Greater Poland (regent)1224/714 April 1279MasoviaYolanda of Hungary
three children
Conrad II 1250 1264-1275 24 June or 21 December 1294 Masovia Hedwig of Legnica
one child
Released after two years of captivity. In 1275 divided the land with his brother Bolesław. After the division of the duchy he received Czersk. His death without male heirs allowed his brother to reunite the Duchy.
Boleslaus II 1253/8 1275-1294 20 April 1313 Płock Gaudemantė Sophia of Lithuania
three children

Kunigunde of Bohemia
(divorced 1302)
two children
Reunited the duchy after the death of his brother, but after his own death Masovia was divided again.
Trojden I 1284/6 1310-1313 13 March 1341 Czersk Maria Yurievna of Galicia-Volhynia
four children
Son of Boleslaus II, retained Czersk during his father's lifetime. After Boleslaus' death, Trojden received more lands in inheritance and made Warsaw his new capital. Put his own son in the throne of Galicia-Volhynia.
Siemowit II12831313-134518 February 1345RawaUnmarriedSon of Boleslaus II, retained Rawa. Left no descendants and his duchy was inherited by his nephews Siemowit III and Casimir I.
Wenceslaus I1293/71313-133623 May 1336PłockDannila Elisabeth of Lithuania
two children
Son of Boleslaus II, retained Płock.
Siemowit II, Duke of Rawa (regent)1283 1336-134018 February 1345PłockUnmarried Regents in name of their nephew, Bolesław III.
Trojden I, Duke of Warsaw (regent)1284/613 March 1341PłockMaria Yurievna of Galicia-Volhynia
four children
Boleslaus III1322/301340-135120 August 1351PłockUnmarriedSon of Wenceslaus. In 1351 Płock was annexed by the Kingdom of Poland.
Annexation to the Kingdom of Poland (1351-1370)
Casimir I 1329/31 1341-1345 26 November/5 December 1355 Warsaw Unmarried Sons of Trojden I, ruled jointly. In 1345 inherited Rawa. In 1349 divided the land between them: Siemowit received Warsaw and Casimir Rawa. After Casimir's death without descendants in 1355, Siemowit reunited Masovia. He also brought Płock from Poland in 1370. After his death the duchy was again divided between his sons Janusz I and Siemowit IV.
1345-1349Warsaw and Rawa
Siemowit III 1320 1341-1345 16 June 1381 Warsaw Euphemia of Opava
five children

Anna of Ziębice
three children
1345-1349Warsaw and Rawa
Janusz I the Elder1347/521381-14298 December 1429WarsawDanutė Anna of Lithuania
four children
Son of Siemowit III, since 1386 hereditary vassal of Poland, after 1391 Duke of Podlasie. Although the division, the duchy of Czersk remained annexed to the duchy of Warsaw.
Siemowit IV the Younger'1353/61381-142621 January 1426Płock and RawaAlexandra of Lithuania
thirteen children
Son of Siemowit III. Since 1386, was an hereditary vassal of Poland, and, although having lost much of his domain to the Teutonic Order in 1382 (Wizna, Zawkrze, Płońsk), he gained other duchies (Bełz) from Poland.
Trojden II1403/61426-142725 July 1427Płock and RawaUnmarried Sons of Siemowit IV, ruled jointly. In 1434 the three surviving brothers divided the land: Siemowit received Rawa, Casimir received Bełz, ad Ladislaus received Płock. The death of Siemowit and Casimir in 1442, both without descendants, allowed Ladislaus to reunite the inheritance of his father.
Siemowit V 13891426-1434 17 February 1442Płock and Rawa Margareta of Opava-Ráciborz
Between 15 October 1434 and 17 February 1437
one child
Casimir II 1401/31426-1434 15 September 1442Płock and Rawa Margareta Szamotuły
26 June 1442
no children
Ladislaus I 1406/91426-1434 11/12 December 1455Płock and Rawa Anna of Oleśnica
two children
1442-1455Płock, Bełz and Rawa-Rawa
Anna of Lithuania (regent)c.1390?1429-14363 May/1 August 1458WarsawBolesław Januszowic, heir of Warsaw
three children
Daughter-in-law of Janusz I the Elder; Regent on behalf of her son.
Boleslaus IV14211436-145410 September 1454WarsawBarbara Olelkovna of Slutsk-Kapy
ten children
Margareta of Opava-Ráciborz14101442-14595 July 1459Rawa-GostyninSiemowit V
Between 15 October 1434 and 17 February 1437
one child
Received Gostynin as her husband's inheritance. After her death her part rejoined Płock.
Anna of Oleśnica (regent)1425? 1455-1459After 15 August 1482Płock and Rawa-RawaWładysław I
two children
Regents on behalf of Anna's sons.
Paul Giżycki, Bishop of Płock (regent)140028 January 1463Płock and Rawa-RawaUnmarried
Siemowit VI2 January 1446 1459-146231 December 1461/1 January 1462Płock and Rawa (Rawa and Gostynin)Unmarried Sons of Ladislaus I, ruled jointly. In 1459 inherited Gostynin from their aunt Margareta. After their deaths, Masovia was again reunited by the sons of Boleslaus IV.
Ladislaus IIAfter 31 October 144827 February 1462Płock and Rawa (Rawa and Gostynin)Unmarried
Barbara Olelkovna of Slutsk-Kapy (regent)1421 1454-146210 September 1454WarsawBolesław IV
ten children
Regents on behalf of Barbara's sons.
Paul Giżycki, Bishop of Płock (regent)140028 January 1463Warsaw
Casimir III 10 June 1448/8 June 1449 1462 9 June 1480 Warsaw Unmarried Sons of Boleslaus IV, ruled jointly. In 1462 they inherited the rest of Masovia, reuniting the Duchy. However in 1471 they made new partitions: Casimir received Płock, however in 1475 abdicated of his lands to his brother Janusz, who hadn't any share of the land since 1471; Conrad received Czersk and Boleslaus Warsaw, which was reunited with Czersk by Conrad after Boleslaus' death in 1488. In 1495, as the last surviving brother in power, he reunited all Masovia definitely.
Boleslaus V c.1453 1462 27 April 1488 Warsaw Anna Radzanów
20 July 1477
(morganatic, annulled 1480)
no children
Janusz II 1455 1462 16 February 1495 Warsaw Unmarried
Conrad III the Red 1447/8 1462 28 October 1503 Warsaw Magdaena Stawrot
no children

before 20 July 1477
(morganatic, divorced 1493?)
no children

Anna Radziwiłł
between 29 September 1496 and 2 April 1497
four children
1488-1495Czersk and Warsaw
Anna Radziwiłł (regent)1475/61503-151815 March 1522MasoviaConrad III
between 29 September 1496 and 2 April 1497
four children
Regent in name of her children.
Janusz III27 September 15021518-15269/10 March 1526MasoviaUnmarried Sons of Conrad III, ruled jointly.
Stanisław I17 May 15011518-15248 August 1524MasoviaUnmarried
Annac.14981526After 26 January 1557MasoviaStanisław Odrowąż
one child
The last Masovian Piast. Sister of Stanislaus and Janusz III. Anna was elected duchess by the nobles to maintain the independence of the Duchy. It was unsuccessful, because, in the same year, Masovia was annexed to the Kingdom of Poland.

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