A painting believed by some experts to be Caravaggio's "Judith Beheading Holofernes" is pictured.

A 13th-century painting by the Italian master Cimabue that goes on auction Sunday, after being discovered in an ordinary home in France, is among a handful of surprising discoveries that have thrilled the art world.

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The Renaissance painter's "Christ Mocked" had been hanging in the elderly woman's kitchen. She had it valued thinking it was just an old religious icon.

Here are three similar astonishing finds.

Caravaggio in the attic

A painting thought to be a lost masterpiece by the Renaissance artist Caravaggio was found under an old mattress in the attic of a house in the French city of Toulouse in 2014.

"Judith and Holofernes", dated to 1606, depicts a biblical scene of the beautiful Jewish widow Judith beheading a sleeping Assyrian general.

"The Mocking of Christ" by the late 13th century Florentine artist Cenni di Pepo also known as Cimabue.

The house owners discovered it while investigating a leak in the ceiling.

After examining the piece for months, Eric Turquin, an art expert in Paris, authenticated the work as a Caravaggio. Most specialists agreed, though some in Italy had their doubts.

Estimated at 100 to 150 million euros ($110 to $170 million), it was due to be auctioned in France in June 2019. But two days before the sale it was snapped up by an anonymous foreign buyer.

Rembrandt bargain

In 2016, a Dutch art dealer bought a portrait at a Christie's auction in London that he was convinced was an authentic Rembrandt, even though it was listed in the catalogue as coming only from the master's "circle."

Rembrandt expert Jan Six had travelled to London days before the auction to discreetly examine the "Portrait of a Young Gentleman".

Amsterdam art dealer and historian Jan Six (R) stands beside 'Portrait of a Young Gentleman' by Rembrandt van Rijn.

Undated and unsigned, it shows a young man wearing a black cloak with a white lace ruffle in a style distinctive of Rembrandt, who died in 1669.

Six bought the piece for 137,000 pounds ($175,000, or 160,000 euros), far below what a real Rembrandt would fetch.

Gauguin left on a train

In 2014, Italian police recovered from a pensioner a painting by French post-impressionist artist Paul Gauguin and another by his contemporary Pierre Bonnard, which were stolen from a house in London in 1970.

Gauguin's "Fruits on a Table" (1889) and Bonnard's undated "Woman with Two Chairs" had been hanging in the retired Fiat factory worker's kitchen since he bought them at auction in 1975 for 45,000 lire, which would be the equivalent of around 238 euros today.

Carabinieri stand next to the two paintings stolen in London in the 1970s by French artists Paul Gauguin.

The unsigned paintings had been auctioned on the second try, because the first failed to attract any bidders after being turned in at the Turin railway station as lost objects left on a train.

One of the buyer's sons recognised the styles of Gauguin and Bonnard after consulting catalogues.

Agence France-Presse