Denmark at several occasions tried to again acquire the principality, yet without or only with temporary success. In 1625, a Danish offer of 150,000 riksdaler for Rügen was rejected. During the Swedish-Brandenburgian War (1675–79) Christian V of Denmark conquered the principality twice, but was unable to keep it afterwards. The last time the principality was under Danish rule was from 1715 until 1721.[3]