Alexandra of Lithuania was born circa 1368 in Vilnius, Lithuania to Algirdas (1296-1377) and Uliana Aleksandrovna of Tver (c1325-1392) and died circa 19 January 1434 Płock, Płock County, Masovian Voivodeship, Poland of unspecified causes. Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Rollo of Normandy (860-932)/s.

Alexandra of Lithuania (c1368-20 April 1434 in Płock)[1] was the youngest daughter of Algirdas, Grand Duke of Lithuania, and his second wife, Uliana of Tver.[2] Though Alexandra's exact date of birth is not known, it is thought that she was born in the late 1360s or early 1370s. In 1387, she married Siemowit IV, Duke of Masovia, and bore him thirteen children.


On December 12, 1385, few months after the Union of Krewo, Siemowit IV, Duke of Masovia, reached a compromise with Jadwiga of Poland and her intended consort king Jogaila, Alexandra's brother. Siemowit IV agreed to cease his rival claims to the Kingdom of Poland, pay homage to Jadwiga and Jogaila, and to assume position of a hereditary vassal to the Polish Crown in exchange for 10,000 Prague groschen and fief Duchy of Belz. The agreement was solidified by marriage of Siemowit IV and Alexandra in 1387.[3]

Alexandra died and was buried in Płock. Her final resting place is likely a church of the Dominican Order.[4]



Offspring of Alexandra of Lithuania and Siemowit IV of Mazovia (c1353-1426)
Name Birth Death Joined with
Kazimierz II of Mazovia
Trojden II of Mazovia
Władysław I of Płock
Siemowit V of Mazovia
Alexander of Mazovia
Eufemia of Mazovia (c1396-c1447) 1386 1447 Bolesław I, Duke of Teschen (c1363-1431)
Cymburgis of Mazovia (c1394-1429) 1394 1449 Türnitz Ernst von Habsburg (1377-1424)
Jadwiga of Mazovia
Amelia of Mazovia
Anna of Mazovia
Maria of Mazovia (c1410-1450) 1410 1450 Bogislaw IX. von Pommern (c1408-1446)
Alexandra of Mazovia
Katarzyna of Mazovia


  1. ^ (Lithuanian) Edvardas Gudavičius (2001). "Aleksandra". In Antanas Račis. Visuotinė lietuvių enciklopedija. I. Vilnius: Mokslo ir enciklopedijų leidybos institutas. p. 306. ISBN 5-420-01485-8. 
  2. ^ Cite error: Invalid <ref> tag; no text was provided for refs named alex
  3. ^ Stone, Daniel (2001). The Polish–Lithuanian State, 1386–1795. A History of East Central Europe. University of Washington Press. p. 7. ISBN 0-295-98093-1. 
  4. ^ Jasiński, Kazimierz (1998). Rodowód Piastów mazowieckich. Poznań - Wrocław: Wydawnictwo Historyczne. p. 90. ISBN 83-913563-0-2. 

Karol Piotrowicz, w: Polski Słownik Biograficzny/ Polish Biographical Dictionary. T. 1. Kraków: Polska Akademia Umiejętności – Skład Główny w Księgarniach Gebethnera i Wolffa, 1935, p. 66–67

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