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.
Bartians The Bartians (also "Barthi", "Barthoni", "Bartens", or "Barti") were an Old Prussian tribe who were among the last pagans of Europe before the Northern Crusades forced their conversion to Christianity. They lived in Bartia (also "Bartenland" or "Barthonia"), a territory that stretched from the middle and lower flow of Łyna river, by the Świna river, and Lake Mamry, up to the Galindian woods. The territory is quite precisely known from description in Chronicon terrae Prussiae, dated 1326.