The Treaty of Perth (1266) records the agreement between Magnus IV of Norway and Alexander III of Scotland concerning the cession of the Isles (Mann and the Sodors) to Scottish sovereignty. The document details payment terms (100 marks annually plus 4,000 marks over four years), succession rights, treatment of inhabitants, and jurisdictional provisions. It includes both English and Latin versions and establishes the constitutional framework for Mann's transition from Norwegian to Scottish overlordship.