Agreement between Sir Magnus IV, king of Norway, by his messengers, Sirs Asketin, his chancellor, and Andrew, son of Nicholas, his baron, and Sir Alexander III, king of Scots, and whereby Sir Magnus, king of Norway, has resigned all right and claim to Man, with the other islands of the Hebrides, and all the other islands of the western and southern side of the great sea; to be held without reservation by King Alexander and his heirs, together with the right of patronage of the bishopric of Man, saving the right, jurisdiction, and liberty of the church of Nidaros, in all respects; which right or jurisdiction the church of Nidaros has, regarding the bishop and church of Man; and excepting the islands of Orkney and Shetland, which the king of Norway has specially reserved for his own demesne; the islands conceded to the king of Scots shall be subject to the laws and customs of Scotland; the king of Scots is to render 100 marks sterling in the church of St Magnus, Orkney, to the king of Norway yearly within the octave of the Nativity of St John the Baptist, plus 4000 marks sterling in the same place and manner over the next 4 years.
2 July 1266
Friday next after the feast of the apostles Peter and Paul.
Diplomatarium Norvegicum: oldbreve til kundskab om Norges indre og ydre forholde, sprog, slægter, sæder, lovgivning og rettergang i middelalderen, vol. 8, ed. G. Storm (Christiania, 1898), no. 9 (online at [http://www.dokpro.uio.no/perl/middelalder/diplomvisetekst.prl?b=7348&s=n&str=])
RRS, iv, no. 61
Donaldson, Scot. Hist. Docs., 34-36 (English translation). This is the ‘Treaty of Perth’