Tautvilas or Towtwil (c.1352–1355 – September 1390) was one of the sons of

Kęstutis Kęstutis ( – 3 or 15 August 1382) was sole Duke of Trakai from 1342 to 1382 and List of Lithuanian monarchs, Grand Duke of Lithuania from 1342 to 1382, together with his brother Algirdas (until 1377), and with his nephew Jogaila (from 1377 to ...

Grand Duke of Lithuania This is a list of Lithuanian monarchs who ruled Lithuania from its inception until the fall of the Grand Duchy of Lithuania in 1795. The Lithuanian monarch bore the title of Grand duke, Grand Duke, with the exception of Mindaugas, who was crown ...

, and a strong supporter of his brother

Vytautas the Great Vytautas the Great (; 27 October 1430) was a ruler of the Grand Duchy of Lithuania. He was also the prince of Grodno (1370–1382), prince of Lutsk (1387–1389), and the postulated king of the Hussites. In modern Lithuania, Vytautas is revere ...

in his struggles against their cousin Jogaila. In 1380, Jogaila signed the secret

Treaty of Dovydiškės The Treaty of Dovydiškės (; ), Daudiske, or Daudisken was a secret treaty signed on 31 May 1380 between Jogaila, the Grand Duke of Lithuania, and Winrich von Kniprode, the Grand Master of the Teutonic Knights. The treaty was directed against ...

with the

Teutonic Knights The Teutonic Order is a Catholic religious institution founded as a military society in Acre, Kingdom of Jerusalem. The Order of Brothers of the German House of Saint Mary in Jerusalem was formed to aid Christians on their pilgrimages to t ...

against Kęstutis. This sparked a civil war. Kęstutis and his son Vytautas was captured and held prisoners in Kreva castle. In 1382 Kęstutis died under suspicious circumstances, while Vytautas managed to escape and sought allies among the Teutonic Knights. Around the same time Jogaila banished Tautvilas from

Navahrudak Novogrudok or Navahrudak (; ; , ; ) is a town in Grodno Region, Belarus. It serves as the administrative center of Novogrudok District. As of 2025, it has a population of 27,624. In the Middle Ages, the city was ruled by King Mindaugas' son ...

that he and his brother

Vaidotas Vaidotas (fl. 1362) was a son of Kęstutis, Grand Duke of Lithuania. In reliable historical sources he is mentioned only twice: as defender of Kaunas Castle in 1362 and as ruler of Navahrudak. Due to very limited information, his life is subje ...

were ruling. Tautvilas then joined the fight of his brother Vytautas. While visiting the Teutonic Knights, he was baptized as Kondrat on October 21, 1383. In 1384 Vytautas and Jogaila reconciled and the civil war ended. When Jogaila signed the

Union of Krewo In a strict sense, the Union of Krewo or Act of Krėva (also spelled Union of Krevo, Act of Kreva; ; ) comprised a set of prenuptial promises made at Kreva Castle on 14 August 1385 by Jogaila, Grand Duke of Lithuania, in regard to his prospectiv ...

and became the

King of Poland Poland was ruled at various times either by dukes and princes (10th to 14th centuries) or by kings (11th to 18th centuries). During the latter period, a tradition of Royal elections in Poland, free election of monarchs made it a uniquely electab ...

, he left his unpopular brother

Skirgaila Skirgaila, also known as Ivan/Iwan ( or 1354 – 11 January 1397; baptized 1383/1384 as ''Casimir''), was a regent of the Grand Duchy of Lithuania for his brother Jogaila from 1386 to 1392. He was the son of Algirdas, Grand Duke of Lithuan ...

as a regent in Lithuania. Vytautas saw this as an opportunity to gain power and started the

Lithuanian Civil War (1389–1392) The Lithuanian Civil War of 1389–1392 was the second civil conflict between Jogaila, King of Poland and Grand Duke of Lithuania, and his cousin Vytautas. At issue was control of the Grand Duchy of Lithuania, then the largest state in Europe. J ...

. His first military campaign against

Vilnius Vilnius ( , ) is the capital of and List of cities in Lithuania#Cities, largest city in Lithuania and the List of cities in the Baltic states by population, most-populous city in the Baltic states. The city's estimated January 2025 population w ...

was not successful and had to turn to the Teutonic Knights for the second time. Tautvilas joined him again. Joint forces of Vytautas and the Knights attacked Vilnius in September 1390. According to the chronicles of

Wigand of Marburg Wigand of Marburg ()Note that ''von Marburg'' is a purely descriptive title added to his original name of Wigand by later historians, rather than a proper surname. Also the ''von'' should not be confused with a preposition used in later times to d ...

, Tautvilas was killed while trying to capture the Crooked Castle. The Samogitian-Danish noble family Blinstrub of Tautvilas claim descent from Tautvilas Kęstutaitis.

References

* {{DEFAULTSORT:Kestutaitis, Tautvilas 1350s births 1390 deaths Gediminids