 Before the terrorist attacks in the United States on 11 September 2001, the subject of terrorism did not loom large in philosophical discussion. Philosophical literature in English amounted to a few monographs and a single collection of papers devoted solely, or largely, to questions to do with terrorism. Articles on the subject in philosophy journals were few and far between; neither of the two major philosophy encyclopedias had an entry. The attacks of September 11 and their aftermath put terrorism on the philosophical agenda: it is now the topic of numerous books, journal articles, special journal issues, and conferences.