The Lithuanian Crusade was a series of campaigns by the Teutonic Order, and the Livonian Order, they first conquered which tribe  Baltic tribe that lived in the southcentral part of contemporary Latvia, and northern Lithuania?
Lithuanian Crusade:  They first conquered other neighboring Baltic tribes – Curonians, Semigallians, Latgalians, Selonians, Old Prussians (see Livonian Crusade and Prussian Crusade). 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.
Semigallians