Stymie, a chestnut horse with a narrow white blaze was bred by Max Hirsch and was born on King Ranch in Texas.
As a young horse, Stymie possessed so terrible a disposition that his ability to race was hampered; his trainer did not see much in him.
At Suffolk Downs on July 7, 1947, Stymie became the first horse ever to eclipse the $700,000 earnings mark.
He was so heavily bet that a minus show pool of $25,887 was created that day, and the tote board briefly jammed due to the flood of money wagered on him.
Jacobs, who died in 1970, was elected as a trainer to the National Museum of Racing and Hall of Fame in 1958.
He and his wife named their Sparks, Maryland, breeding operation Stymie Manor.