トニービン
Circus Ring was a dark-coated bay filly with no white markings, bred and owned by the Snailwell Stud of Newmarket, Suffolk. She was sired by High Top, who won the 2000 Guineas in 1972 and later became a successful breeding stallion. His other progeny included the St Leger Stakes winner Cut Above, the Oaks winner Circus Plume and the Prix du Jockey Club winner Top Ville. Circus Ring's dam Bell Song was a great-granddaughter of the 1000 Guineas winner Campanula, whose other descendants have included Athens Wood, Tony Bin, Dibidale (Irish Oaks), Vitiges (Champion Stakes) and Bolkonski.