The city of Danzig (Gdańsk) was captured by the State of the Teutonic Order on 13 November 1308, resulting in a massacre of its inhabitants and marking the beginning of tensions between Poland and the Teutonic Order. Originally the knights moved into the fortress as an ally of Poland against the Margraviate of Brandenburg. However, after disputes over the control of the city between the Order and the King of Poland arose, the knights murdered a number of citizens within the city and took it as their own. Thus the event is also known as Gdańsk massacre or Gdańsk slaughter. Though in the past a matter of debate among historians, a consensus has been established that many people were murdered and a considerable part of the town was destroyed in the context of the takeover.

Gdańsk is a city on the Baltic coast of northern Poland. With a population of 486,492, Gdańsk is the capital and largest city of the Pomeranian Voivodeship. It is Poland's principal seaport and the country's fourth-largest metropolitan area. The city lies at the southern edge of Gdańsk Bay, close to the city of Gdynia and resort town of Sopot; these form a metropolitan area called the Tricity (Trójmiasto), with a metropolitan population of approximately 1.5 million. Gdańsk lies at the mouth of the Motława River, connected to the Leniwka, a branch in the delta of the Vistula River, which connects Gdańsk with Warsaw.