On 25 March 1522 a young soldier hung up his sword in front of a small statue. He crossed himself and looked at the dark features of a crowned woman and the child seated upon her knee, hand raised in benediction. Then he turned and limped away, his leg still weak from the cannonball that had wrecked it. He would wage war no more. The man was Ignatius of Loyola and he would go on to found the Jesuits. The statue was the Black Virgin of Montserrat, and she would go on to greet pilgrims by the million.

Black Madonnas – that is pictures or statues of Mary that depict her with dark skin – are widespread through the Catholic world and often come with a reputation for working miracles. Theories as to why Mary should be represented thus vary from the spurious (they’re really depictions of Isis and Horus) to the practical (centuries of candle smoke have stained them) but whatever the reason they always seem to evoke popular devotion.

La Moreneta, or ‘Little Dark One’ as the Virgin of Montserrat is usually called, is no exception. Pious enthusiasm dates the statue to St Luke in the first century, po-faced scepticism to the 12th. Whichever is true – and there is also evidence for the statue having been hidden from the Moors and then rediscovered in the ninth century – what is certain is how quickly the statue became a major centre of pilgrimage from the 12th century onwards. This was no doubt helped by the identification of the mountain as the site of the Holy Grail in Wolfram von Eschenbach’s medieval romance Parsifal. But what really swung it was the miracles. And it certainly didn’t hurt that King Alfonse X ascribed miracles to Our Lady of Montserrat in his canticles, songs composed in honour of the Blessed Virgin that are still sung. For when all is said and done, one can gauge the popularity of shrines by their results: those that produce get the pilgrims, those that don’t fade into obscurity. By these standards the Little Dark One must still be doing the business: even today more than two million people visit each year.