Question: What is the name of the Baltic tribe duke known as King Vester?
Sentence (from "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.
Relevant evidence: Yes