CAMPBELL, Archibald, third Duke of Argyll, brother of the preceding, was born at Hamhouse in England, in June 1682, and was educated at the university of Glasgow. He afterwards studied civil law at Utrecht; but, upon his father being created a duke, he betook himself to a military life, and served for a short time under the Duke of Marlborough. In 1705 he was appointed treasurer of Scotland, and in the following year was one of the commissioners for treating of the Union; on the consummation of which, he was chosen one of the sixteen peers for Scotland in the first parliament of Great Britain. In 1711 he was called to the privy-council; and when the rebellion broke out in 1715, he took up arms in defence of the house of Hanover, and received a wound at the battle of Sheriffmuir. He was appointed keeper of the privy seal in 1725, and afterwards intrusted with the principal management of Scottish affairs. It was by his advice that, after the rebellion in 1745, the Highlanders were employed in the royal army. In 1734 he was made keeper of the great seal, an office which he held till his death. The duke was eminent not only for his political abilities, but for his literary accomplishments, and had collected one of the most valuable private libraries in Great Britain. He died suddenly on the 15th of April 1761, in the seventy-ninth year of his age.