Courtney J. P. Friesen explores shifting boundaries of ancient religions by way of the reception of a popular tragedy, Euripides' Bacchae. As a play staging political crises provoked by the arrival of the "foreign" god Dionysus and his ecstatic cult, audiences and readers found resonances with their own cultural moments. This dramatic deity became emblematic of exuberant and liberating spirituality and, at the same time, a symbol of imperial conquest. Thus, readings of the Bacchae frequently foreground conflicts between religious autonomy and political authority, and between ethnic diversity...