Editing Bolesław III Wrymouth (section)

===Conquest of Rügen and alliance with Wartislaw I===
To consolidate his power over Pomerania Bolesław conducted an expedition to the island of [[Rügen]] in 1130. For this purpose, he concluded an alliance with the Danish duke [[Magnus I of Sweden|Magnus Nilsson]] (his son-in-law<ref>Around 1127, Magnus married [[Richeza of Poland, Queen of Sweden|Ryksa]], Bolesław's eldest daughter</ref>) who provided him with a fleet in exchange for support in his efforts to obtain the Swedish throne. The fleet transported Polish troops to Rügen, but the intended battle on the island never happened, because, at the sight of the Polish-Danish combined forces, the defending [[Rani (Slavic tribe)|Rani]] recognized Bolesław's overlordship.<ref>E. Kosiarz: ''Wojny na Bałtyku X-XIX w.'', p. 38.</ref>

After the successful invasion of the Danish capital, [[Roskilde]], in 1134, Bolesław formed an alliance with Wartislaw I of Pomerania against King [[Eric II of Denmark]], an ally of Emperor Lothair III. The role of the Polish duke was limited to aiding the [[House of Pomerania|House of Griffins]], not due while the real interest in Danish affairs. The Danish, after repelling the first attack, led a successful retaliatory expedition and expansion into Pomerania.