Semigallians (Latvian Zemgaļi; , 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. Semigallians had close linguistic and cultural ties with Samogitians. Name The name of Semigallia appears in contemporary records as Seimgala, Zimgola and Sem[e]gallen. The -gal[l] element means "border", while the first syllable corresponds to ziem ("north") or zem ("low"). So the Semigallians were the "people of the northern borderlands" or "people of the low borderlands", i.e. the lower parts of the Mūša and Lielupe river valleys. History During the Viking Age, the Semigallians were involved in battles with Swedish Vikings over control of the lower part of the Daugava waterway. In Gesta Danorum the Danish chronicler Saxo Grammaticus wrote that the Viking Starkad crushed the Curonians, all the tribes of Estonia, and the peoples of Semgala. When the Rurikid successors of the Varangians tried to subjugate the Semigallians, they defeated the invading army of Polotsk led by Prince Rogvolod Vseslavich in 1106. Ancient russian chronicles claim that 9000 of russian soldiers were killed. At the start of German conquests Semigallian lands were divided in Upmale, Dobele, Spārnene, Dobe, Rakte, Silene and Tērvete chieftaincies. According to the Livonian Chronicle of Henry, Semigallians formed an alliance with bishop Albert of Riga against rebellious Livonians before 1203, and received military support to hold back Lithuanian attacks in 1205. In 1207, the Semigallian duke Viestards () helped the christened Livonian chief Caupo conquer back his Turaida castle from pagan rebels. In 1219, the Semigallian-German alliance was canceled after a crusader invasion in Semigallia. Duke Viestards promptly formed an alliance with Lithuanians and Curonians. In 1228, Semigallians and Curonians attacked the Daugavgrīva monastery, the main crusader stronghold at the Daugava river delta. The crusaders took revenge and invaded Semigallia. The Semigallians, in turn, pillaged land around the Aizkraukle hillfort. In 1236, Semigallians attacked crusaders retreating to Riga after the Battle of Saule, killing many of them. After regular attacks, the Livonian Order partly subdued the Semigallians in 1254. In 1270, the Lithuanian Grand Duke Traidenis, together with Semigallians, attacked Livonia and Saaremaa. During the Battle of Karuse on the frozen gulf of Riga, the Livonian Order was defeated, and its master Otto von Lutterberg killed. In 1287, around 1400 Semigallians attacked a