Alexandra was the youngest daughter of Grand Duke of Lithuania Algirdas

Algirdas

Algirdas was a monarch of medieval Lithuania. Algirdas ruled the Grand Duchy of Lithuania from 1345 to 1377, which chiefly meant monarch of Lithuanians and Ruthenians...

 and his second wife Uliana of Tver. In 1387 Alexandra married Siemowit IV, Duke of Masovia

Siemowit IV, Duke of Masovia

Siemowit IV was one of the Dukes of Masovia of the old Polish Piast royal family. His domain included the lands of Czersk, Rawa, Sochaczew, Płock and Gostynin. In 1381 he inherited Wisz and in 1387 Bełz.-Life:Siemowit IV was a son of Siemowit III...

. The marriage followed Union of Krewo

Union of Krewo

In a strict sense, the Union of Krewo or Act of Krėva was a set of prenuptial promises made in the Kreva Castle on 14 August 1385 by Jogaila, Grand Duke of Lithuania, in exchange for marriage to the underage reigning Queen Jadwiga of Poland...

 when Siemowit IV agreed not to rival Grand Duke of Lithuania Jogaila

Jogaila

Jogaila, later 'He is known under a number of names: ; ; . See also: Jogaila : names and titles. was Grand Duke of Lithuania , king consort of Kingdom of Poland , and sole King of Poland . He ruled in Lithuania from 1377, at first with his uncle Kęstutis...

 (brother of Alexandra) and to support him as the new King of Poland. Alexandra's and Siemowit's daughter Cymburgis

Cymburgis of Masovia

Cymburgis of Masovia in January 1412 became the second wife of the Habsburg Duke Ernest the Iron of Austria and thus a Duchess/Archduchess of the Inner Austrian line in Styria, Carinthia and Carniola.Cimburgis was born at Warsaw in the Duchy of Masovia to Duke...

 married Ernest, Duke of Austria

Ernest, Duke of Austria

Ernest the Iron was Duke of Styria, Carinthia and Carniola from 1406 until his death. He was a member of the Habsburg dynasty, of the Leopoldian line, whose head of the family he was from 1411 to 1424.-Biography:...

 in 1412. The wedding took place in Buda

Buda

For detailed information see: History of Buda CastleBuda is the western part of the Hungarian capital Budapest on the west bank of the Danube. The name Buda takes its name from the name of Bleda the Hun ruler, whose name is also Buda in Hungarian.Buda comprises about one-third of Budapest's...

 (Ofen), residence of Sigismund, Holy Roman Emperor

Sigismund, Holy Roman Emperor

Sigismund of Luxemburg KG was King of Hungary, of Croatia from 1387 to 1437, of Bohemia from 1419, and Holy Roman Emperor for four years from 1433 until 1437, the last Emperor of the House of Luxemburg. He was also King of Italy from 1431, and of Germany from 1411...

. At the time the emperor mediated negotiations between Alexandra's brother King of Poland Jogaila

Jogaila

Jogaila, later 'He is known under a number of names: ; ; . See also: Jogaila : names and titles. was Grand Duke of Lithuania , king consort of Kingdom of Poland , and sole King of Poland . He ruled in Lithuania from 1377, at first with his uncle Kęstutis...

 and the Teutonic Knights

Teutonic Knights

The Order of Brothers of the German House of Saint Mary in Jerusalem , commonly the Teutonic Order , is a German medieval military order, in modern times a purely religious Catholic order...

. Two other daughters married Michael Žygimantaitis, pretender to the throne of the Grand Duchy of Lithuania

Grand Duchy of Lithuania

The Grand Duchy of Lithuania was a European state from the 12th /13th century until 1569 and then as a constituent part of Polish-Lithuanian Commonwealth until 1791 when Constitution of May 3, 1791 abolished it in favor of unitary state. It was founded by the Lithuanians, one of the polytheistic...

.

External links

• Genealogy of the House of Gediminas
• Genealogy of the House of Piast