What is "ribocco"

Ribocco (foaled 1964 in Kentucky) was an American-bred British-trained Thoroughbred racehorse and sire. He is best known for his performances in 1967 when he won two of the most important European races for three-year-olds; the Irish Derby and the St Leger. Ribocco briefly held the record for prize money won by a British-trained racehorse.