The small portrait of Mary Magdalene is being displayed for a month in the Sainte-Marie-Madeleine basilica in the Var département of southern France, which houses relics of Mary Magdalene - making it Christianity's third most important tomb.
AFP saw around 50 visitors queuing Sunday afternoon to admire this forgotten painting by Raphael, known for painting "Three Graces" and "The School of Athens".
The painting is thought to date back to a meeting between the painter and Leonardo da Vinci in 1505.
Visitors were required to pay €3 to see the work, which will be used to support the restoration of the basilica.
A French collector bought the portrait from a London gallery's website for £30,000.
He then called a UNESCO expert in Italy, who authenticated the work in September.
After countless analyses - including infrared light to reveal the layers of carbon hidden by the paint pigments - they were able to attribute the painting to Raphael (1483-1520).
Mary Magdalene, the first witness to the resurrection of Jesus, is an important figure in the Gospels.
Often presented as a repentant sinner, she is said to have spent the last 30 years of her life in a cave in the Sainte-Baume massif, some twenty kilometres from the basilica, which has become a major Christian pilgrimage site.
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