Treaty of Soldin (1309)

[1] In 1308, the Order had agreed to help Polish forces retake the city of Danzig (Gdańsk) from the Brandenburgians, in exchange for being allowed to garrison a nearby fort for a year.

As a result, they purchased these from Brandenburg, as well as the rights to most of Pomerelia (Dirschau (Tczew), Schwetz (Świecie) and their hinterlands) for 10,000 silver Mark,[1] despite the fact that the initial claims to Danzig and surrounding areas by Brandenburg were themselves of dubious legality.

[2] The treaty was subsequently confirmed in 1311 by Emperor-elect Henry VII,[2] but repeatedly questioned by Poles, resulting in the Polish-Teutonic Wars.

The treaty gave the Teutonic Order control of the lower Vistula, a direct access to the Baltic Sea through Danzig, and a continuous route into the Holy Roman Empire.

The same year the treaty was signed, the order's headquarters were moved from Venice to Marienburg (Malbork).