The Treaty of Melno, a peace treaty between the Grand Duchy of Lithuania and Poland, concluded on 27 September 1422 with representatives of the Teutonic Order in the camp of the allied troops at Lake Melno (on the right bank of the Vistula, near the Osa River) after the Order's unsuccessful war with Poland in 1422.
The Treaty of Melno was essentially the result of the victory over the Teutonic Order at the Battle of Grunwald (1410).
The Treaty of Melno ended the wars of the Grand Duchy of Lithuania with the Teutonic Order. The treaty (entered into force on 7 June 1424) did not satisfy either side. The border established by it (which remained until the Treaty of Versailles in 1919) separated the western Lithuanian lands and the emerging Lithuania Minor from Lithuania. Only the territory between Palanga and Šventoji, which the Teutonic Order particularly sought, went to Lithuania (it gained access to the Baltic Sea); This is how the Teutonic Order and the Livonian Order were divided (they reproached Emperor Sigismund I for making excessive concessions to the Grand Duchy of Lithuania because of the Hussites).