 Complete the following phrase:  Though documented, human sacrifice was rare in Rome during the historical period. Livy and Plutarch both considered it alien to Roman tradition. This aversion is asserted also in an aetiological myth about sacrifice in which Numa, second king of Rome, negotiates with Jupiter to replace the requested human victims with vegetables. In the first century BC, human sacrifice survived perhaps only as travesty or accusation. Julius Caesar was accused  rather vaguely  of sacrificing two mutinous soldiers in the Campus Martius. On the 