What is the name of the Baltic tribe duke known as King Vester?
Viestards Viestards (also "Viesthard, Vesthardus, Viesturs") was one of the greatest Semigallian dukes in the 13th century, referred to as King Vester (Old High German: "konic Vesters" ). His capital was Tērvete hillfort. During the first decades of the 13th century he was allied with the Livonian Brothers of the Sword against Lithuanians, who looted Semigallia on several occasions. In 1205, joint forces of semigallians and crusaders defeated Lithuanians and killed duke Žvelgaitis.
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.