What is the name of the Baltic tribe duke known as King Vester?
Semigallians Semigallians (Latvian "Zemgaļi"; Lithuanian: "Žiemgaliai" , also Zemgalians, Semigalls, Semigalians) were the Baltic tribe that lived in the southcentral part of contemporary Latvia and northern Lithuania. They are noted for their long resistance (1219–1290) against the German crusaders and Teutonic Knights during the Northern Crusades.
Narimantas Narimantas or Narymunt (baptized "Gleb", born in 1277 or just before 1300 (according to Wasilewski 1992) – 2 February 1348) was the second eldest son of Gediminas, Grand Duke of Lithuania. During various periods of his life, he ruled Pinsk and Polatsk. In 1333 he was invited by Novgorod's nobles to rule and protect territories in the north, Ladoga, Oreshek and Korela. He started the tradition of Lithuanian mercenary service north of Novgorod on the Swedish border that lasted until Novgorod's fall to Moscow in 1477.