During the reign of Charles the First, his descendants were considered to be steady Royalists; but, notwithstanding their claiming descent from the Stuarts, the views and principles of the family in the troublous period of the Revolution of 1688, underwent a total change. William, the third Earl of Kilmarnock, and the father of the unhappy adherent of Charles Edward, took the oaths of allegiance to the reigning family, and supported the Treaty of Union; joining at first the party entitled the _Squadrone volante_; but eventually deserting them for the Whigs. When the Insurrection of 1715 broke out, this nobleman plainly manifested that the notions which had actuated his ancestor to join the association at Cumberland in favour of Charles the First, were no longer deemed valid by him. The superiority of the Burgh of Kilmarnock having been granted in 1672 to his ancestors, the Earl summoned the inhabitants of the Burgh to assemble, and to arm themselves in support of Government. At the general meeting of the fencible corps at Cunningham, Lord Kilmarnock appeared, followed by five hundred of his men, well armed, and so admirably trained, that they made the best figure on that occasion among the forces collected.[318] In compliance with orders which he received from the Duke of Argyll, Lord Kilmarnock marched with his volunteers to garrison the houses of Drummakil, Cardross, and Gastartan, in order to prevent the rebels from crossing the Forth. Unhappily for the fortunes of his family, the Earl died two years afterwards: and in the year 1717, his son, then a boy of fourteen years of age, succeeded to his title. The mother of the young nobleman still survived: she was the Lady Eupheme, daughter of William, eleventh Earl of Ross; and one child only, the Earl of Kilmarnock, had been the issue of her marriage.