To further strengthen the rule of the Wittelsbach dynasty in Northern Germany, Margrave Louis was married to Princess Margaret (1305–1340), the eldest daughter of King Christopher II of Denmark, in 1324. Nevertheless, the Wittelsbach rule in Brandenburg never earned much popular support. As a consequence of the murder of Provost Nikolaus von Bernau by Berlin and Cölln citizens in 1325, the twin-town was punished with a papal interdict. Subsequently, the public unrest led to a resurgence of the centuries-long Brandenburg–Pomeranian conflict from 1328 onwards. The Pomeranian dukes had to withdraw from the Uckermark region after a series of battles throughout the late 1320s and early 1330s. In 1330, they took their duchy as a papal fief to circumvent the Brandenburg claims. In 1338, they finally concluded a peace with the Wittelsbach margrave, who renounced his claims on overlordship but maintained the right of succession.