During the Prussian Crusade from about 1200 onwards, the area of the local Baltic Skalvian and Curonian pagans was conquered by German military orders, at first by the Sword Brethren, after the 1236 Battle of Saule by the Teutonic Knights. When in the early 15th century the State of the Teutonic Order interfered with the neighbouring Grand Duchy of Lithuania and the Kingdom of Poland, culminating in the Polish–Lithuanian–Teutonic War, the 1422 Treaty of Melno finally fixed the borders of the Monastic State with the Lithuanian Samogitia region.