Even before the Congress of Merseburg took place, Bolesław persuaded one of ruling dukes of Western Pomerania, Ratibor I, to make an expedition against Denmark, a clear provocation to Emperor Lothair III, as the King of Denmark was a German vassal. A Pomeranian fleet of 650 boats (with 44 knights and 2 horses) attacked the rich Norwegian port city of Kungahälla (now Kungälv in Sweden).L. Fabiańczyk: Apostoł Pomorza, p. 70.
Even before the Congress of Merseburg took place, Bolesław persuaded one of ruling dukes of Western Pomerania Ratibor I, to make an expedition against Denmark, a clear provocation to Emperor Lothair III, as the King of Denmark was a German vassal. A Pomeranian fleet of 650 boats (with 44 knights and 2 horses) attacked the rich Norwegian port city of Kungahälla (now Kungälv in Sweden).L. Fabiańczyk: Apostoł Pomorza, p. 70.