The Battle of Saule (German: Schlacht von Schaulen; Latvian: Saules kauja; Lithuanian: Saulės mūšis or Šiaulių mūšis) was fought on September 22, 1236 between the Livonian Brothers of the Sword and pagan Samogitians. Between 48 and 60 knights were killed, including the Livonian Master, Volkwin. It was the earliest large-scale defeat suffered by the orders in Baltic lands. The Sword-Brothers, the first Catholic military order established in the Baltic lands, was soundly defeated and its remnants accepted incorporation into the Teutonic Order in 1237. The battle inspired rebellions among the Curonians, Semigallians, Selonians, Oeselians, tribes previously conquered by the Sword-Brothers. Some thirty years' worth of conquests on the left bank of the river Daugava were lost. To commemorate the battle, in 2000 the Lithuanian and Latvian parliaments declared September 22 to be the Day of Baltic Unity.