Lengvenis ( – after 19 June 1431) was one of the sons of Algirdas, Grand Duke of Lithuania, who was the prince of Novgorod (1389–1392; 1406–1411). 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.
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Lengvenis ( – after 19 June 1431) was one of the sons of Algirdas, Grand Duke of Lithuania, who was the prince of Novgorod (1389–1392; 1406–1411). 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.
==Life== Lengvenis was born to Algirdas and his second wife Uliana of Tver. In 1387, Lengvenis commanded one of Lithuanian formations in a battle with the Teutonic Order. Invited by the Novgorodians themselves, Lengvenis was first regent in Great Novgorod in 1389–1392, responsible to Jogaila, the Grand Duke of Lithuania. He was baptized in the Eastern Orthodox rite as Semën and received the title of Prince of Great Novgorod. After Lengvenis lost this title in 1392, Vytautas the Great appointed him in 1393 as the Prince of Mstislavl in then eastern Lithuania. In 1406–1411, Lengvenis, once again, was regent of Great Novgorod, this time responsible to Vytautas. As ruler of Novgorod he led battles against Pskov Republic, Livonian Order, and Sweden.
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