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Lengvenis (Simeon Lingwen, born ca. 1360 – died after 1431) was one of the sons of Algirdas, Grand Duke of Lithuania, and the ruler of Great Novgorod (1389 – 1392, 1406 – 1411).

Lengvenis was born to Algirdas and his second wife Uliana Alexandrovna of Tver. In 1389-1392 he was nominated by his brother Jogaila, Grand Duke of Lithuania and King of Poland, as regent of Great Novgorod. He was baptised in the Orthodox rite as Simon and became the Prince of Great Novgorod. After Lengvenis lost this title in 1392, Vytautas the Great gave him Mstislavl. In 1406 – 1411 Lengvenis, once again, was nominated by Vytautas as regent of Great Novgorod. In 1410, he participated in the Battle of Grunwald, under Vytautas command, was a commander of the three banners from Smolensk. His son Jurgis (baptized Yurij) commanded one of these banners. In 1411 Lengvenis participated in the signing of the Peace of Torun. He was married to Maria Dmitrovna, princess of Moscow, the daughter of Dmitri Donskoi.

Contents 1 Family 1.1 Parents 1.2 Wife 1.3 Brothers 1.4 Sisters 1.5 Sons 2 References

• Uliana Alexandrovna of Tver (ca 1325 – 1392)
• Algirdas (ca 1304 – end of May 1377), Grand Prince of Lithuania (1345 – 1377)

• Maria Dmitrovna, princess of Moscow.

• Demetrius I Starszy (1327 – 12 August 1399 in the Battle of the Vorskla River), Prince of Trubczewsk (1357 – 1399), Briansk (1357 – 1379), Starodub (1370 – 1399), and Druck
• Andrew (Wigund; 1325 – 12 August 1399 in the Battle of the Vorskla River; baptized in Moscow in 1342), Prince of Polock (1342 – 1387), Pskov (1341 – 1343, 134? – 1348, 1377 – 1379, 1394 – 1396)
• Constantine (?? – before 30 October 1390), Prince of Czartorysk
• Vladymir (?? – after October 1398), Prince of Kiew, Kopylsk, Sluck
• Fiodor (Theodore; ?? – 1399), Prince of Rylsk (1370 – 1399), Ratnie (1387 – 1394), Bryansk (1393)
• Jogaila (ca 1351 – 1 June 1434 in Gródek Jagielloński), Grand Prince of Lithuania (1377 – 1381, 1382 – 1392), King of Poland (1386 – 1434)
• Skirgaila (Ivan; ca 1354 – 11 January 1397 Kiew), Prince of Trakai (1382 – 1395), Kiew (1395 – 1397), regent of Lithuania
• Korybut (Dymitr; after 1350 – after 1404), Prince of Novgorod-Seversky (1386 – 1392/93)
• Karigaila (Cassimir; after 1350 – 1390), Prince of Mscislaw, regent
• Wigunt (Alexander; after 1350 – 28 June 1392), Prince of Kernavė
• Švitrigaila (Swidrygiello, Svitrigaylo, Boleslaw; ca 1370 – 10 February 1452 Luck), Prince of Witebsk (1392 – 1393, 1430 – 1436), Podolia (1400 – 1402), Novgorod-Seversky (1404 – 1408, 1420 – 1438), Czernichow (1419 – 1430), Grand Prince of Lithuania (1430 – 1432), ruler of Wolynia (1437 – 1452)

• Fiedora (born 14th century)
• Agrypina (Mary; 14th century – 1393)
• Kenna (Joan; ca 1350 – 27 April 1368), Princess of Słupsk
• Helen (after 1350 – 15 September 1438), the wife of Vladimir the Bold
• Mary (after 1350 – ?), Princess of Lithuania
• Wilheida (Catherine; after 1350 – after 4 April 1422), Princess of Lithuania
• Alexandra (after 1350 – 19 June 1434), Princess of Czersk, Rawa, Sochaczew, Płock, Gostynin, Płońsk, and Kujawy
• Jadwiga (after 1350 – after 1407), Princess of Oświęcim 1395/96 – 1405

• Jurgis Lengvenaitis (baptised Yurij, born ? died about 1457), Prince of Mstislavl from 1443

1. (Lithuanian) Batūra, Romas (2005). "Lenvenis", Vytautas Spečiūnas (compiler) Gediminaičiai. Vilnius: Mokslo ir enciklopedijų leidybos institutas, 184. ISBN 5-420-01558-7
2. (Lithuanian) Jučas, Mečislovas (1990). Žalgirio mūšis (Battle of Grunwald). Vilnius: Mokslas, 174. ISBN 5-420-00242-6.