Recent research has pointed to the possibility that Dunachton may have been the correct site of the Battle of Dun Nechtain in 685, when Bridei mac Bille, king of the Pictish kingdom of Fortriu defeated Ecgfrith of Northumbria, securing Pictish independence from Northumbria.
Eventually, in about 672, Æthelthryth persuaded Ecgfrith to allow her to become a nun, and “she entered the monastery of the Abbess Æbbe, who was aunt to King Ecgfrith, at the place called the city of Coludi (Coldingham, Berwickshire), having received the veil of the religious habit from the hands of the aforesaid Bishop Wilfrid”.
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The Northumbrians were lured by a feigned flight in the mountains and Ecgfrith was then slain at the Battle of Nechtansmere, located at either Dunnichen in Angus or Dunachton in Badenoch.
In June 684 Ecgfrith, the King of Northumbria, sent an army under Berht to Ireland which laid waste to the plain of Brega, the heart of Fínsnechta's kingdom.
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In 678 Saint Wilfrid was imprisoned at Dunbar, following his expulsion from his see of York by Ecgfrith of Northumbria.