 Its roots are unknown, although one theory is that ponies of ancient stock were brought to Indonesia by the Chinese in the 6th century.If this theory is true, the Bali pony would owe much of its roots to the Mongolian horse.In addition to the Mongolian horse, it is known that some Indian stock were taken to Indonesia (although it is unknown exactly which breeds), and the Dutch also brought various eastern breeds to the country during the 18th century.