It has been the object of the writer to make each of these “famous assassinations” the central scene of a picture in which the political, religious, or national features of the epoch in which the assassination occurred are portrayed with historical fidelity and strict impartiality…. Only those assassinations have been included which either had an important and political bearing on the world, or on the nation immediately affected, or which left a profound, and, it would seem, indelible impression on the imagination of contemporaries and posterity. - Summary by Book Preface