Argyll, John Campbell, 2d duke of, 1678–1743, Scottish general; son of the 1st duke, whom he succeeded in 1703. For his ardent support of the union of England and Scotland he was created (1705) earl of Greenwich. He served under the duke of Marlborough in the War of the Spanish Succession (1701–14) and rose to be commander in chief in Spain in 1711. On his return to Scotland he actively supported the succession of George I. He commanded the army that put down the Jacobite rebellion in 1715 and was made duke of Greenwich in 1719.