Zarathustra was a black

Black (horse)

Black is a hair coat color of horses in which the entire hair coat is black. Black is a relatively uncommon coat color, and novices frequently mistake dark chestnuts or bays for black. However, some breeds of horses, such as the Friesian horse, Murgese and Ariegeois are almost exclusively black...

 thoroughbred

Thoroughbred

The Thoroughbred is a horse breed best known for its use in horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed...

 racehorse

Horse racing

Horse racing is an equestrian sport that has a long history. Archaeological records indicate that horse racing occurred in ancient Babylon, Syria, and Egypt. Both chariot and mounted horse racing were events in the ancient Greek Olympics by 648 BC...

, born at Graymount in Antrim

Antrim, County Antrim

Antrim is a town in County Antrim in the northeast of Northern Ireland, on the banks of the Six Mile Water, half a mile north-east of Lough Neagh. It had a population of 20,001 people in the 2001 Census. The town is the administrative centre of Antrim Borough Council...

, Northern Ireland

Northern Ireland

Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

 in 1951.

Owned by Terence Gray (Wei Wu Wei)

Wei Wu Wei

Terence James Stannus Gray , better known by the pen name Wei Wu Wei, was a 20th century Taoist philosopher and writer.-Background:...

, it was first trained by Michael Hurley in Ireland, becoming the winner of the Irish Derby and the Irish St. Leger in 1954.

After its transfer to Newmarket, Suffolk in 1956, it was trained by Cecil Boyd-Rochfort

Cecil Boyd-Rochfort

Sir Cecil Charles Boyd-Rochfort CVO was a British thoroughbred racehorse trainer who was British flat racing Champion Trainer five times....

 winning the Ascot Stakes in 1956. In 1957, ridden by renowned jockey Lester Piggott

Lester Piggott

Lester Keith Piggott is a retired English professional jockey, popularly known as "The Long Fellow". With 4,493 career wins, including nine Epsom Derby victories, he is one of the most well-known English flat racing jockeys of all time....

, it won the Ascot Gold Cup

Ascot Gold Cup

The Gold Cup is a Group 1 flat horse race in Great Britain open to thoroughbreds aged four years or older. It is run at Ascot over a distance of 2 miles and 4 furlongs , and it is scheduled to take place each year in June....

in the first of Piggott's eleven wins of that race.

Exported to Japan in 1964, he died there in 1967.