Loudoun County Seal
The Loudoun County Seal is a genuine coat-of-arms devised in 1968 by the College of Arms in London. Based on the coat-of-arms of the Earl of Loudoun, for whom the county was named, it was the first official seal accorded by the College of Arms to an American county.
, attendant flag
, and a 300-pound stone from Loudoun Castle in Scotland were presented to Loudoun County by the Countess of Loudoun and the Queen's representative, the Rouge Dragon, in a special ceremony.
In heraldic language the arms reads "Gyronny ermine and gules with bordure embattled vert gutty argent."