When Carlos Acosta danced Spartacus with the Bolshoi Ballet in London in 2007, the man, the time and the place united the strands of a most extraordinary story in ballet, a story of peregrination, of dreadful reverses, of the pursuit of civilisation, of holding on to the best of human values in despairing times.

THE choreographer George Balanchine died on April 30, 1983, aged 79, of Creutzfeldt-Jacob disease, a rare, if nowadays notorious, condition only discovered at his autopsy. What had been recognised long before his death, though, was that this man was one of the very greatest geniuses of the 20th century, a figure to be reckoned alongside Pablo Picasso in art and Igor Stravinsky in music.