International art dealer Guy Wildenstein leaves the court on the opening day of his trial in Paris, France, January 4, 2016. Wildenstein, 70, Franco-American heir of a New York art-dealing empire, is going on trial on charges of defrauding the French state of half a billion euros (about $550 million) in taxes, after two relatives tipped off authorities about the family's financial dealings. REUTERS/Charles Platiau