DUNNING, when first heard of in authentic history, formed part of the ancient Stewartry of Strathearn. That Stewartry, or Earldom, dates back to a remote antiquity. The beautiful valley, from which it derived its name, has special points of interest for the antiquarian, having been the scene of many remarkable events in the early history of the country. The great battle of Mons Grampus (A.D. 84) (Tacitus, Life of Agricola, c.29 ff.), which for a time made the Roman legions masters of the Scottish Lowlands, was fought within or near its borders, where the Caledonian army, under Galgacus or Calgacus, was defeated by the Roman general, Agricola, with great slaughter, and 10,000 patriot warriors lay slain on their native heath.
Dunning its Parochail History