Semigallians

Semigallians (Latvian: Zemgaļi; Lithuanian: Žiemgaliai; also Zemgalians, Semigalls or Semigalians) were the Baltic tribe that lived in the south central 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.

The name of Semigallia appears in contemporary records as Seimgala, Zimgola and Sem[e]gallen. The -gal[l] (gale) element means "end", while the first syllable corresponds to zem ("low"). So the Semigallians were the "people of the low end", i.e. the lower parts of the Mūša and Lielupe river valleys.

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 Curonians crushed the Danish Vikings.

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 (Latin: dux Semigallorum) 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 crusader stronghold in Ikšķile and plundered nearby lands. As they returned to Semigallia they were caught by the Order's forces, and the great battle began near the Garoza river (Battle of Garoza). The crusader forces were besieged and badly defeated. More than 40 knights were killed, including the master of the Livonian Order Willekin von Endorp, and an unknown number of crusader allies. It was the last Semigallian victory over the growing forces of the Livonian Order.

In 1279, after the Battle of Aizkraukle, Grand Duke Traidenis of Lithuania supported a Semigallian revolt against the Livonian Order led by duke Nameisis. In the 1280s, the Livonian Order started a massive campaign against the Semigallians, which included burning their fields and thus causing famine. The Semigallians continued their resistance until 1290, when they burned their last castle in Sidrabene, and a large number of Semigallians – the Rhymed Chronicle claims 100,000 – migrated to Lithuania and once there continued to fight against the Germans.