Every year on September 22, Latvia, Lithuania and Estonia celebrate the Baltic Day of Unity.
In 1207 the Order of the Swordsmen seized the territories of the Livs, in 1214 - the lands of the Latgalians. The purpose of the order was to gain military, political control over the Baltics and to convert the Baltic people to Christianity.
On September 22, 1236, the monks of the Order and the crusaders made a robbery raid on Lithuania. When they returned home with rich booty, the Baltic people united in the city of Saule and repelled the attack of uninvited guests. The Order of the Swordsmen was defeated.