Lengvenis was one of the sons of Algirdas, Grand Duke of Lithuania, who was the prince of Novgorod. He was one of the most famous commanders of Vytautas the Great. He was baptized in the Eastern Orthodox rite as Semën to be titled the prince of Novgorod.
- Position held
- starosta of Polotsk, Q18235684, Prince of Polotsk
- Citizenship
- Lithuania
- Born
- 1356, 1355
- Died
- June 19, 1431
