 There was also significant direct Norse influence exerted in Galloway in south west Scotland and for much of the period, up until the 1266 Treaty of Perth, Norwegian and Danish foreign policy and the activities of independent or semi-independent Norse rulers of the above parts of Scandinavian-dominated Scotland had a powerful influence on the affairs of Scotland as a whole.Contemporary documentation of the Viking period of Scottish history is very weak.The presence of the monastery on Iona led to this part of Scotland being relatively well recorded from the mid-6th to the mid-9th century.