This is the climactic volume on the archaeological and architectural history from ca. 31 B.C. to A.D. 365 of the extramural sanctuary of Demeter and Persephone at Cyrene, Libya. It deals with the impact of Christianity on the cult and the causes of its decline, with particular emphasis on the largest body of evidence recorded anywhere for iconoclastic damage, presumably by Christian populations, to sculpted images of worshippers and twin goddesses. The volume traces the characteristics of major Demeter sanctuaries elsewhere (e.g., Eleusis, Corinth, Pergamon, Acragas, and Selinus) and places Cyrene's sanctuary within the context of this development. The volume also presents the sanctuary's important lapidary and lead inscriptions as analyzed by Joyce Reyonlds. It is the eighth volume in the final reports series for the excavations conducted for the University of Michigan, and subsequently the University of Pennsylvania Museum of Archaeology and Anthropology, between 1969 and 1981.