The Davidsons became quite powerful but they became involved in various feuds, particularly with the MacPhersons (another part of Clan Chattan), following a dispute in 1370 over who should lead the right wing in a battle between the Clan Chattan and the Camerons. The MacPhersons withdrew and the Davidsons suffered heavy casualties. The Davidsons are said to have formed a part of the Clan Chattan force which fought in the famous "Battle of the Clans" at Perth in 1396. This was staged in front of King Robert III. As a result of these two battles, the Davidsons lost many men and declined in power and became scattered.
The chieftainship of the clan was held by a Davidson from Tulloch for many years, possibly after the chief moved north after the Battle of the Clans. There were Davidsons in Tulloch, Ross-shire through to the early part of the 20th century. Tulloch Castle was the seat of the Davidson chief for many years.
There were Davidsons of Cantray, Inverness and Davidsons of Inchmarlo, Deeside. The Davidsons in Aberdeen can be traced back to the late 14th century when Robert Davidson was Provost of the city - he was killed at the Battle of Harlaw in 1411.
In the south, probably unconnected to those in the Highlands, there were Davidsons in Ayrshire, Roxburghshire, Midlothian and Edinburgh. In the early 1600s, Queen Elizabeth I had a secretary named Davidson "whose grandfather was out of the North" and in the reign of Charles II, the Scots Commercial Representative at Veere in Holland was Sir William Davidson from Dundee.
The Davidson clan motto is "Sapienter si sincere" which means "Wisely if sincerely".
Surnames regarded as septs (sub-branch) of the Davidson clan include Davie, Davis, Davison, Dawson, Day, Dean, Dow, Kay, McDade, McDaid, MacDavid.
Davidson was the 24th most frequent surname at the General Register Office in 1995.
There is a Davidson clan Web site here.
