Treaty of Kępno

[4] The merger of Gdańsk Pomerania with Przemysł's other Polish provinces of Poznań, Wielkopolska, and Kraków was an important step in the process of reunification of Poland,[5] after its feudal break up, which took place after the death of Bolesław III Wrymouth in 1138.

[2][3] In the following year (1296) however, he was assassinated by agents of the Margrave of Brandenburg and some Polish nobles (the Nałęcz family), as both parties opposed the rise of a strong central power in Poland.

[6] Przemysł's realm, including Pomerania, became the subject of a civil war between Wenceslaus II of Bohemia and Władysław I the Elbow-high, both of whom at some point crowned themselves as kings of Poland.

[7] The immediate effect of the treaty was that Mestwin and Przemysł began to carry out a single foreign policy, particularly in regard to Brandenburg and Western Pomerania.

The meeting in Słupsk in November 1284 was particularly important as it was also attended by the Duke of Szczecin-Pomerania (one of the duchies of Western Pomerania), Bogusław IV of the Griffins dynasty.

Przemysł II of Poland
Mestwin II , Duke of Pomerania
Map of the provinces of Wielkopolska and Gdańsk Pomerania unified under Przemysł II as a result of the treaty (in yellow). The agreement would serve as a basis for Przemysł's crowning (1296) as the first King of Poland since 1076, and the first ruler of reunified Poland since 1138. The map shows the situation from 1295, when the province of Kraków (in red), previously controlled by Przemysł, has been taken over by Wenceslaus II of Bohemia .