L'Enfant a l'Orange - or The Child With An Orange - will go on sale next month at the European Fine Art Fair in Maastricht, the Netherlands.

BBC: Van Gogh painted the portrait after meeting his nephew

The Child With An Orange was one of several works Van Gogh painted after spending time with his baby nephew and godson, named Vincent after the artist.

BBC: Van Gogh painted the portrait after meeting his nephew

Born on 27 April 1967 as the first child of Queen Beatrix and the late Prince Claus, the Prince of Orange is the first male head of state of the Netherlands since 1890.

BBC: Profile: Willem-Alexander, King of the Netherlands