Eventually he became court painter to the Holy Roman Emperor Charles V and Philip II, King of Spain.

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Vicari was once court painter to the Saudi Arabian royal family and government.

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She initially assumed autism, but found more clues in this portrait of Peter, by court painter William Kent, that hangs in Kensington Palace.

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Among the star exhibits is a decadent portrait of the man himself, composed of fruit and vegetables by Giuseppe Arcimboldo, his court painter.

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As court painter (and ultimately curator of the royal collections), he knew that no new painter could outshine the royal masterpieces by Titian, Tintoretto and Rubens.

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Port Talbot-born Vicari, who lives in Monaco, was once court painter to the Saudi Arabian royal family and government and is often described as one of the world's richest living artists.

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"Salvator Mundi" is going on public display in London in November, as part of the exhibition Leonardo da Vinci: Painter at the Court of Milan at The National Gallery.

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"This was a really destitute person, " said Harriet Wood, 75, a painter from South Woodbury whose works are on display at the Vermont Supreme Court.

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