Career
1360 – died after 1431. Belarusian: Лугвен-Сымон, Łuhvien. Russian: Лугвений, Лугвен, Лугвень, Lugven(y), Polish: Lingwen Semen Olgierdowicz) was one of the sons of Algirdas, Grand Duke of Lithuania, and the ruler of Great Novgorod Republic (1389–1392, 1406–1411).
He was known for his skills as a military leader.
He was baptized in the Orthodox rite as Simon and received the title of Prince of Great Novgorod. After Lengvenis lost this title in 1392, Vytautas the Great appointed him to Mstislavl.
In 1406–1411 Lengvenis, once again, was nominated by Vytautas as regent of Great Novgorod. As ruler of Novgorod he led battles against Pskov, Livonian Order, and Sweden.
In 1410, Lengvenis participated in the Battle of Grunwald and commanded three banners from Smolensk.
In 1411 Lengvenis participated in the signing of the Peace of Thorn.
