New York’s now-closed Knoedler Gallery is being sued by a family trust for allegedly selling them a forged painting by Mark Rothko for $5.5 million.  The gallery has faced similar lawsuits in the past, and is accused of withholding information that may have discouraged the sale, including telling the buyers that the work came from the secret collection of a “Mr. X.”  “At all relevant times, defendants knew that the Mr. X story was untrue,” lawyers for the trust stated. “Indeed, defendants privately equated Mr. X to the fictional ‘goose that laid the golden egg.’”