Context
On 20 May 685, the Picts under Bridei mac Bili defeated and killed Ecgfrith of Northumbria at the Battle of Nechtansmere, or Dún Nechtain. Tradition places it near Dunnichen Hill in Angus, beside a mere that has since vanished. In 1948 Dr F. T. Wainwright mapped the lost loch from aerial photography and flood marks.