In the present article I discuss the remarkable fact that many of the motifs to be found in Seneca's tragedies - such as a horrible death, a madman, an obsession or some supernatural agent - are also to be found in abundance in the work of "Gothic" authors such as Ann Radcliffe and Edgar Allan Poe. Indeed, these motifs are now commonly considered to be the hallmark of the Gothic genre. I also analyse some of the techniques which Seneca uses to arouse fear and stimulate the reader's imagination, comparing them with those used by Poe and other Gothic writers.