What sport is called sports of kings?

Answer 1

That is an article nothing related to any actual facts. Whilst I haven't provided any concrete facts it the oldest stories of Horse Racing that tell of the Kings picking their finest Horses to race each other over long distances.

The Europeans expanded and took what are the founding fathers of the thoroughbred world back with them; The Byerley Turk, Goldophin Arabian and the Darley Arabian. Every thoroughbred in the world can trace their lineage back to one of these founding fathers of the Sport of Kings.

Answer 2

From the late 1100s The Sport of Kings was, and still is, horse-racing

For some vague reason some people in America suggest that it is Polo; Maybe because some of the recent royal males have been polo players.

Polo was not even known by Europeans until about the 1830s, when the British in India took it up from the Indians, where is was played in Manipur. It originated about 500 BCE in Persia and was migrated right across to China and India.

Horse racing was the sport of at least the following list of British Monarchs: Richard I, Henry VIII, Queen Elizabeth I , James I, Charles I , Charles II, Edward VII, Queen Elizabeth II