The Treaty of Perth, concluded between Alexander III and King Magnus the Law-Mender of Norway, permanently transferred the Hebrides and Isle of Man to Scotland in exchange for 4,000 marks and an annual payment of 100 marks. It ended three centuries of Norwegian sovereignty over the Western Isles. The treaty was one of the greatest diplomatic achievements of any Scottish king, completing what Alexander III's ancestors had been attempting for generations. The annual payment -- the Annual of Norway -- was paid intermittently until it became one of the pretexts for the Scottish acquisition of Orkney and Shetland in 1468.
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