On 22 September 1236, the Battle of Saulė between Samogitians and the Livonian Brothers of the Sword took place close to Šiauliai. The Livonian Brothers were defeated during it and their further conquest of the Balts lands were stopped. 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 Daugava were lost. In 2000, the Lithuanian and Latvian parliaments declared 22 September to be the Day of Baltic Unity.