Juliette Marny was a bay mare with no white markings[1] bred in Wiltshire by the Fonthill Stud which was managed by James Ian Morrison, the filly's owner throughout her racing career.

Juliette Marny's dam Set Free, was in fact the first mare covered in Blakeney's first season at stud after the inexperienced stallion reportedly "took a while to realise was what required of him".

In 1975 she produced the St Leger Stakes winner Julio Mariner (also by Blakeney) and in the following year she foaled Scintillate a filly who won the Oaks in 1979.

[6] On her first appearance as a three-year-old, Juliette Marny contested the Group Three Princess Elizabeth Stakes over eight and a half furlongs at Epsom Downs Racecourse in April.

[6] On 7 June, Juliette Marny contested the 197th running of the Oaks Stakes at Epsom and started at odds of 12/1 in a field of twelve fillies.

Racing on firm ground, she took the lead a furlong from the finish and drew clear to win very easily by four lengths from Val's Girl with the favourite Moonlight Night in third.