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.
Tautvilas Tautvilas (or Tautvila; died 1263) was Duke of Polatsk and one of the sons of Dausprungas and nephews of King of Lithuania Mindaugas. Tautvilas together with his brother Edivydas and uncle Vykintas waged a civil war against Mindaugas. The war resulted in coronation of Mindaugas.