Treaty of Kalisz (1343)

Treaty of Kalisz
Pokój kaliski (pl)
Vertrag von Kalisch (de)
Signed 8 July 1343
Location Kalisz, Poland
Effective 23 July 1343
Condition Exchange of deeds
Signatories  Poland
 Order State

The Treaty of Kalisz (Polish: Pokój kaliski, German: Vertrag von Kalisch) was a peace treaty signed by King Casimir III the Great of Poland and the Teutonic Knights on 2 June 1343 in Kalisz.

It concluded the Polish-Teutonic War (1326–1332). The Polish king had to renounce claims to Chełmno Land and Gdańsk Pomerania (Pomerelia). In exchange, Poland regained Kuyavia and the Lands of Dobrzyń. The Polish side also acknowledged other territorial acquisitions of the Order, e.g. those gained by the Treaty of Soldin.

However, King Casimir (and subsequently his successors) did not stop using the title of Duke of Pomerania. This was based on a separate clause of the treaty that recognised that he had been the suzerain of the concerned lands. Additionally, the treaty did not have Poland recognise the right of the Order to the lands, leaving their status in a legal limbo. Poland had renounced its claims but without recognising those of the Order.

As part of the treaty, the king of Poland also became a patron of the Order, which was obliged to aid Poland militarily and ro make symbolic feudal payments. In practice, this meant that if the Order ever went to war against the Polish kings, it would lose all rights to the lands that were subject of the treaty. As a result, while Pomerelia remained a subject of contention, the treaty was followed by 66 years of peace, until the conflict erupted again in the Polish–Lithuanian–Teutonic War of 1409. By the Second Peace of Thorn in 1466, the Polish crown regained the Pomerelian lands, which were then incorporated into Royal Prussia.

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