The Golden Age of the Christian Picts: Evidence for Religious Production at Portmahomack- Part 2
The Golden Age of artisan efforts at the Tarbat monastery did not last nearly as long as the monastery of Iona; the industrial locations were burned in a site wide fire in the eighth or ninth century, indicating they had only been utilized for a couple centuries before the sites were rendered unusable. The artisan workshops were the first aspect of the monastery to suffer from the flames that would serve as the beginning of the end for the Pictish establishment identifiable by "multi-colored deposits—white, pink, red, orange, black, the garish remains of straw, heather and timber consum...
Source: ancient-origins.net