Adopted by the Board of Supervisors on 16 January 1968, the arms of Loudoun County, Virginia, were modelled after those of its namesake, John Campbell, 4th Earl of Loudoun, Commander-in-Chief, North America, and Governor General of Virginia (1756-1759). The arms were recorded by the College of Arms in London after suitable differencing — the addition to the shield of an embattled bordure, commemorating President James Monroe and the Monroe doctrine, “Vert and gutty Argent,” representing the county’s agricultural and dairying interests, and the alteration of Campbell of Loudoun’s motto (by a single letter) from “I Byde My Tyme” to “I Byde My Time.” The county celebrated its new coat of arms on 14 March 1968 with a gala event featuring an official presentation from the Rouge Dragon Pursuivant, Sir Conrad Swan.
