Arthur Clark Griswold (9 August 1834 - December 29, 1960) was an American pure-blood wizard, former Auror and revolutionary, as well as one of the original members of the United States Magical Secret Service, a fact that has been whitewashed from American historical records due to Griswold's actions as part of the Rebellion in the American Civil War. Arthur was the son of Callahan Griswold and grandson of revolutionary hero Clark Griswold. Griswold was home-schooled by his parents and became best friends with Muggle-born wizard Wesley James, a family friend.