The prophecies of the 16th-century author Nostradamus have become a part of the popular culture of the 20th and 21st centuries. Nostradamus' life has been depicted in both fiction and non-fiction books as well as several films, and made-up prophecies that were said to be his were circulated online in several well-known hoaxes, where quatrains in the style of Nostradamus have been circulated by e-mail. The most well-known hoax claims that he predicted the attack on New York City's World Trade Center on September 11, 2001.