[citation needed] The clan asserts that Stout Duncan's relatives and followers (not yet known as Robertsons) supported Robert the Bruce at the Battle of Bannockburn in 1314.

Clandonoquhy had rather a reputation as raiders and feuders in late medieval Scotland, though the chiefs seem always to have been loyal to the Bruce and Stewart royal dynasties.

[7] Robert Riabhach ("Grizzled") Duncanson, 4th Chief of Clann Dhònnchaidh, was a strong supporter of King James I (1406–1437) and was incensed by his murder at the Blackfriars Dominican Friary in Perth.

[8] The Robertson crest badge of a right hand upholding an imperial crown was awarded by James II (1437–60) to the 4th chief on 15 August 1451 as a reward for capturing his father's assassins.

The highly unusual third supporter (below the shield) on the Robertson coat of arms, of a "savage man in chains" is in reference to the capture of Graham.

[8] Struan (Gaelic Sruthan, "streams"), is a parish church, of early Christian origin and dedicated to St. Fillan, at the confluence of the Errochty Water and Garry rivers.

Recent excavations by members of the Clan Donnachaidh Society within the now redundant church of Dull (Gaelic Dul, "meadow", "haugh") failed to find evidence of this specific burial, although others were uncovered, along with early medieval carved stones.

[7] During this time, the main Robertson castle at Invervack, near the present Clan museum, was burned by Cromwell's forces, and many family records were lost.

The Clan Robertson played a major part in the fighting at the Battle of Inverlochy (1645) in support of the royalist, James Graham, 1st Marquis of Montrose, where they put the king's enemies to flight.

[17][20][19] A similar poem in Canadian Gaelic attacks James Gillanders of Highfield Cottage near Dingwall, who was the Factor for the estate of Major Charles Robertson of Kincardine.

As his employer was then serving with the British Army in Australia, Gillanders was the person most responsible for the mass evictions staged at Glencalvie, Ross-shire in 1845.

[7] Note: the common spelling often appears with an "a" after the double nn of Dhònnchaidh, but this is not correct (though it does reflect the Gaelic insertion of an epenthetic vowel in pronunciation).