He is best known for his performances in 1968 when he won two of the most important European races for three-year-olds; the Irish Derby (in which he defeated Sir Ivor), and the St Leger.
[4] Ribero turned into the straight in second place behind Giolla Mear before moving up along the rail to take the lead and win by two lengths from Sir Ivor and record a "stunning upset" victory.
[5] Ribero was well-fancied for the King George VI and Queen Elizabeth Stakes at Ascot in July, but unseated Piggott and bolted before the start, only being brought under control after several minutes.
In August, Ribero was moved up in distance to contest the Prix Kergorlay over 3000 m but ran poorly, finishing last of the seven runners.
Ridden by Piggott, Ribero turned into the straight in fourth place before taking the lead 1+1⁄2 furlongs from the finish and holding the late challenge of the Irish-trained Canterbury to win by a short head, with Connaught fifth.
His son Torus became a successful National Hunt stallion, siring the Cheltenham Gold Cup winner Mr Mulligan.