Gallahadion (1937-Not found) was an American Thoroughbred racehorse best known as the 1940 winner of the Kentucky Derby. He was a son of the Champion sire Sir Gallahad III, and his damsire was U.S. Horse of the Year Reigh Count, who won the 1928 Kentucky Derby. Owned by Ethel V. Mars' Milky Way Farm, named for her company's famous chocolate bar brand, Gallahadion raced at age three in California.