In the following years, Canute tried in vain to defeat Sweyn III on Zealand for complete control over Denmark. In 1147, Canute and Sweyn united to undertake the Wendish Crusade, which however ended in the re-ignition of their strife. Sweyn and his cousin Duke Valdemar, the son of Canute Lavard, defeated Canute in Jutland in 1150, and Canute fled to his father-in-law Sverker I of Sweden. Canute attempted a number of reconquests, all of them unsuccessful, and turned to Frederick Barbarossa for help. The resulting compromise of 1152, which was supported by Valdemar, made Canute the inferior co-regent of Sweyn. However, Sweyn decided not to effectuate the deal.