リヴォニア騎士団
Vainius first appears in written sources in 1324. In 1326, as Duke of Polatsk, he signed a treaty with the Livonian Order and Novgorod. Scholars place his death sometime between 1338 and 1342. Vainius' only known son, Liubko, died in 1342 during a battle with the Livonian Order.