The Livonian Brothers of the Sword were founded in 1202 to conquer and convert pagan Livonia for the bishops of Riga. Brutal and independent, they carved out a crusader state on the eastern Baltic before their army was annihilated at Saule in 1236, after which the survivors were folded into the Teutonic Order.
The Livonian Brothers of the Sword were the first of the Baltic crusading orders — warrior-monks raised to conquer the pagan peoples of Livonia, on the far north-eastern edge of Latin Christendom. In a single generation they built a crusader state around Riga by relentless, often merciless war.
Fiercely independent of the bishops who founded them, they were also brittle: when a Lithuanian and Semigallian army destroyed their field force at Saule in 1236, the order could not recover, and the remnant was absorbed into the Teutonic Order.
Bishop Albert of Riga, needing soldiers to hold his new mission, founded the order in 1202; Pope Innocent III confirmed it in 1204 and gave it a rule modelled on the Templars. Its brothers fought their way up the Daugava and Gauja rivers, storming and building castles and forcing baptism on the Livs, Latgalians, and Estonians.
By the 1230s the Sword-Brothers held a wide swathe of the eastern Baltic — but they quarrelled endlessly with the bishops over the division of the conquered land, keeping the larger share for themselves.
In 1236 the order launched a raid deep into Samogitia. On the way home, on boggy ground at Saule, it was trapped and destroyed by Samogitians and Semigallians; the master, Volkwin, and much of the brotherhood were killed.
The blow was fatal. The next year Pope Gregory IX, with the Teutonic Grand Master Hermann von Salza brokering the arrangement, incorporated the survivors into the Teutonic Order, where they became its semi-autonomous Livonian branch.
The Sword-Brothers left behind the crusader state of Livonia — a patchwork of order lands and bishoprics that would endure, under their Teutonic successors, for three more centuries.
Their brief, violent career set the pattern for the Baltic crusades: conquest by castle-building, forced conversion, and constant friction between the military order and the churchmen it was meant to serve.