Rywalizacja i współpraca. Polityka Barnima I (1233-1278) i Bogusława IV wobec Piastów (1278-1309) – zarys problemu
Rivalry and Cooperation. The Policies of Barnim I (1233–1278) and Bogusław IV (Bogislaw IV) (1278–1309) Regarding the House of Piast – an Outline of the Issue

Summary/Abstract: The goal of this paper was to analyse the relations of the House of Piast with West Pomerania under the reign of Barnim I (1233–1278) and his son Bogusław IV (Bogislaw IV) (1278–1309). The results of the analysis suggest that the hostile relations which emerged between Barnim I and the Piasts of Silesia and Greater Poland were a consequence of the military rivalry over the borderlands on Noteć, especially Santok and its castellany. In addition, the Piasts were evidently not ready to pursue closer political relations with Barnim I, but the Duke of West Pomerania was not prudent in his political calculations either. As for the rule of Barnim’s son Bogusław IV (Bogislaw IV), the circumstances were theoretically more favourable for establishing cooperation with the Piasts of Greater Poland, namely Przemysł II. Moreover, there was even an attempt at doing so in 1287 in a coalition with the Duke of Pomerania, Mściwój II (Mestwin II), but it did not bring Bogusław IV (Bogislaw IV) any significant political gains. He began hoping for an alliance with the powerful Lübeck, which was backed by the increasingly influential – economically and politically – Hanseatic cities. A new chapter in the relations with the House of Piast began with the events of the second half of the last decade of the 13th century. The partition of West Pomerania in 1295 and the murder of Przemysł II in February 1296 have completely changed Bogusław IV’s (Bogislaw IV) political standing. He attempted to start a cooperation with the new rules of the Greater Poland province, Władysław Łokietek (the Short), but the latter did not stay in power in that area (until 1299). The Czech Přemyslids, who have taken control of Greater Poland and reigned over it until 1306, were determined to work with the Margraves of Brandenburg, who were hostile towards Bogusław IV (Bogislaw IV). In turn, the Silesian Piast Henryk III głogowski (Henry III of Głogów), who ruled his province in 1306–1309 was conflicted with Władysław Łokietek (the Short) and not interested in the relations with the House of Griffins.

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