 The reserved, patrician tastemaker and socialite was also known for her inclusion in Truman Capote's circle of "swans" wealthy, stylish, and well-married women friends whose company he adored because they "had created themselves, as he had done", and "had stories to tell" According to Capote, Agnelli was "the European swan numero uno", one of the youngest in a group which included Babe Paley, Gloria Guinness, C. Z.Guest, Slim Keith, Pamela Harriman, Lee Radziwill and Jacqueline Kennedy Onassis.In her autobiography, "Washington Post" publisher and Capote friend Katharine Graham recounted that the author once told her that if Paley and Agnelli were "both in Tiffany's window, Marella would be more expensive" (Personal History, p. 393).