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: ''For other nobles of the same name, please see Sigismund.''



'Sigismund I Kestutian' (, , ; born after 1350, murdered 20 March 1440 in Trakai Peninsula Castle) was the Grand Prince of Lithuania from 1432 to 1440. Sigismund (transcribed as ''Žygimantas'' in Lithuanian) was his baptismal name; Sigismund's pagan Lithuanian birth name is unknown.
Son of Grand Prince of the Lithuania Kęstutis and his second wife Birutė. After the death of Kęstutis, he was a prisoner of Jogaila from 1382-1384. Sigismund was Baptised Catholic in 1383. In 1384, he escaped to the Teutonic Order to join his brother Vytautas. In 1389-1398 Sigismund was a hostage of the Teutonic Order together with his family and Vytautas family once again. He became Prince of Navahradak, 1390 - 1440, and Starodub since 1406. Participated in the Battle of Vorskla and the Battle of Grunwald. After the death of Vytautas, he supported Švitrigaila in his fight against Poland, but later was convinced to participate in a conspiracy against him.
On September 1, 1432 Sigismund became Grand Duke of Lithuania and had to accept the conditions of the Polish Crown. In 1434, he issued a privilege to nobles of Eastern Orthodox faith, making their rights equal to the rights of noble Roman Catholics. He guaranteed that no noble of Grand Duchy of Lithuania can be imprisoned and punished without a court.
Sigismund's army defeated Švitrigaila in the Battle of Pabaiskas on September 1, 1435. Livonian Order, supporting Švitrigaila, suffered a major defeat. After strengthening his positions in Lithuania, he tried to loosen this ties with Poland and started negotiations 1438-1440 with Albert II, Holy Roman Emperor but was unable to finish them, since he was killed by supporters of Švitrigaila (possibly led by Alexander Czartoryski) on March 20, 1440.

Contents

Family

Mother

Father

Wife

Brothers

Sisters

Son

See also

Family

Mother

:Birutė (+ possibly murdered 15 August 1382 in Kreva)

Father

:Kęstutis (1297 – 15 August 1382 Kreva), Prince of Trakai, Grand Prince of Lithuania 1381 – 1382

Wife

:Andrejewna, daughter of Prince Andrej Odynczewicz
:NN, January 1416

Brothers

:Patirg (1348 - 1365)
:Vaidotas (+ after 1362), Prince of Black Ruthenia 1347 - 13??
:Vaišvila (+ ca 1387)
:Butaw (Henryk; + after 1381), baptized Köningsberg 25 July 1365, Prince of Black Ruthenia 13?? - 1381
:Vytautas the Great (
★ 1344/1350, + 27 October 1430 Lutsk), baptized (cath) 21 October 1383 as Wiganda, (orth) 1384 as Alexander; Grand Prince of Lithuania 1392 - 1430
:Tautvilas (Conrad; + September 1390), baptized 21 October 1383, Prince of Black Ruthenia 1386 - 1390

Sisters

:Mikova (Maria; + 1404), Grand Princess of Tver 1375 - 1404
:Danuta (Anna; 1362 - 25 May 1448), Princess of Warsaw shortly before 27 September 1376 - 8 December 1429
:Rymgajla (Elisabeth; +1433), Princess of Masovia 4 February - 30 June 1392, Voivodess of Moldau 1419 - 1421

Son

:Michael Boleslaw (
★ before 1406, + shortly before 10 February 1452)

See also

:Gediminids
:List of Belarusian rulers
:List of Lithuanian rulers