The Treaty of Melno was signed, establishing the Prussian–Lithuanian border, which afterwards remained unchanged for about 500 years.

Treaty of Melno

1422 treaty ending the Gollub War

The Treaty of Melno or Treaty of Lake Melno was a peace treaty ending the Gollub War. It was signed on 27 September 1422, between the Teutonic Knights and an alliance of the Kingdom of Poland and the Grand Duchy of Lithuania at Lake Melno, east of Graudenz (Grudziądz). The…