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The Duchy of Warsaw^[a] was a feudal district duchy in Masovia, centered on the Warsaw Land. Its capital was Warsaw.^[1]

The state was established in 1310, in the partition of the Duchy of Masovia, with duke Siemowit II of Masovia becoming its first leader.^[1] It existed until 5 November 1370, when, under the rule of duke Siemowit III, duchies of Czersk, Rawa, and Warsaw were unified into the Duchy of Masovia.^[2][3] It was again re-established in June 1381, in the partition of the Duchy of Masovia, with duke Janusz I of Warsaw as its first leader.^[4][5][6] It existed until 1488, when it got incorporated into the Duchy of Czersk.^[7]

From 1310 to 1320, it was a fiefdom within the Kingdom of Poland, and from 1320 to 1385, a fiefdom of the United Kingdom of Poland, and from 1386 to 1488, a fiefdom of the Crown of the Kingdom of Poland.

List of rulers

First state

• Siemowit II of Masovia (1310–1313)
• Trojden I (1313–1341)
• Siemowit III and Casimir I of Warsaw (1341–1349)
• Casimir I of Warsaw (1349–1355)
• Siemowit III (1355–1370)

Second state

• Janusz I of Warsaw (1381–1429)
• Bolesław IV of Warsaw (1429–1454) (Anna Fiodorówna [pl] as the regent from 1429 to 1436)
• Casimir III of Płock, Konrad III Rudy, and Bolesław V of Warsaw (1454) (Barbara Aleksandrówna and Paweł Giżycki [pl] as regents)
• Casimir III of Płock, Konrad III Rudy, Bolesław V of Warsaw and Janusz II of Płock (1455–1471) (Barbara Aleksandrówna and Paweł Giżycki as regents from 1455 to 1462)
• Bolesław V of Warsaw (1471–1481)

Citations

Notes

References

Bibliography

• Janusz Grabowski, Dynastia Piastów Mazowieckich.
• Anna Suprunik, Mazowsze Siemowitów.
• J. Krzyżaniakowa, J. Ochmański, Władysław II Jagiełło