Although it was claimed that he was once engaged, Newton never married. The French writer and philosopher Voltaire, who was in London at the time of Newton's funeral, said that he "was never sensible to any passion, was not subject to the common frailties of mankind, nor had any commerce with women—a circumstance which was assured me by the physician and surgeon who attended him in his last moments". This now-widespread belief that he died a virgin has been commented on by writers as diverse as mathematician Charles Hutton, economist John Maynard Keynes, and physicist Carl Sagan.