galerie

Galerie Kraemer and its director, Laurent Kraemer, were also accused of deception by gross negligence for selling on some of the chairs – something they both deny.

But charges against both Laurent Kraemer and Galerie Kraemer, which sold on some of the forged chairs to collectors such as Versailles and Qatar's Prince al-Thani, were upheld.

It was bought by the Tate collection from the Galerie Jan de Maere in Brussels in 1994, after Rene van den Broeck had purchased Mr Hartveld's collection and home for a "paltry sum", the panel said.

Now, the Neue Galerie has gathered about 60 works spanning his career into the first exhibition of his landscapes.

He started painting at 16, and the show at the Neue Galerie opens with some of his earliest efforts.