DAVIDSON, the name of a minor clan, a branch of the clan Chattan; in Gaelic, Clann Dhaibhidh or Clann Dhai, pronounced Clan Chai; badge, the red whortleberry. The ancestor of the clan Davidson is said to have been David Dhu, fourth son of the famous Muriach, parson of Kingussie, from whose elder descendants spring the chieftains of the clan Chattan. The clan Dhai were settled at Inverahavon, in Badenoch, and are supposed by some writers to have been the clan Kay who took part in the combat on the North Inch of Perth, in presence of Robert III., in 1396. The circumstances which led to their deadly feud with the MacPhersons, and to that memorable clan combat, are detailed under the head MACPHERSON. After that fatal and sanguinary fight, in which only one of the clan Dhai escaped, the chief of the Davidsons, with part of his tribe, went northwards and settled in the county of Cromarty, on a property called Davidston. About the middle of the 18th century that property was sold, and the estate of Tulloch, in Ross-shire, purchased from the Baynes in 1753. Davidson of Tulloch, the chief of the clan, is hereditary keeper of the royal castle of Dingwall.