One of the best pieces in the collection is Portrait of a Lady by Matisse that once belonged to Paul Rosenburg, the grandfather of Anne Sinclair, the former wife of the disgraced head of the IMF, Dominique Strauss-Kahn. Miss Sinclair has been a prominent campaigner for the return of art looted by the Nazis to their former owners. Rosenburg lost his own collection when he fled for his life during the fall of Paris.