The smirking face of the Devil has been discovered hidden in a fresco by the Italian medieval artist Giotto after remaining undetected for more than 700 years in the Basilica of St Francis in Assisi.

The Satanic image went unnoticed until now because it is artfully hidden in the folds of a cloud and is invisible from ground level.

The discovery of the face, in a fresco which depicts the death of St Francis, was made by Chiara Frugoni, a medievalist and an expert on the saint.

“It’s a powerful portrait, with a hooked nose, sunken eyes and two dark horns,” Ms Frugoni said in an article in a forthcoming issue of the St Francis art history periodical.

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