The MacMillans of Dunmore
In 1666 Archibald MacMillan, Tacksman of Clachbreck, acquired a "wadset feu charter" for Dunmore from the Earl of Argyll. In 1723 his grandson Duncan MacMillan, 3rd of Dunmore, was described by Buchanan of Auchmar as the "principal person of the Macmillans of Argyle-Shire...", and in 1742 the same Dunmore matriculated arms in the Lyon Court as "representative of the ancient family of MacMillan of Knapdale". As such the Dunmore family, who are the ancestors of the present chief of the clan, are taken to be descendants of the Alexander MacMillan who was Constable of Castle Sween in the 1470s, and who's commemorated on the famous cross at Kilmory Knap - but exactly how Archibald 1st of Dunmore was related to Alexander of the Cross cannot at present be determined, and the descent given him in our Project MAOL file (like the two hazarded by Somerled MacMillan in his clan histories) remain for now speculative.
The Knapdale MacMillan Chiefs in Project MAOL
Our knowledge of the Dunmore family itself is also very incomplete, but Somerled MacMillan established the descent of the two main lines in 1951 when he proved that General Sir Gordon MacMillan was the nearest surviving heir of Duncan 5th of Dunmore (grand-nephew of Duncan 3rd of Dunmore) who had died childless in Edinburgh in 1799.