Taking two early Tibetan texts as his starting point, Jacob Dalton explores the ways in which violence has been integral to the development of Tibetan Buddhism. Paying particular attention to the so-called age of fragmentation, Tibet's dark age that spanned from 842 to 986 C.E., he draws on previously unstudied manuscripts discovered in the famous "library cave" near Dunhuang, on the old Silk Road. These demonstrate how this supposedly inactive period in Tibetan history was in fact crucial to the Tibetan assimilation of Buddhism, and particularly to the spread of the violent themes of tantric Buddhism, at both the local and popular levels. From the late tenth century onward, this period and its mythic and ritual themes of violence, demon taming, and blood sacrifice came to play important symbolic roles in Tibetan history and politics. Despite its reputation as a tradition utterly opposed to violence, Tibetan Buddhism has long been haunted by violent rituals and imaginative associations. The resulting history challenges our own tendencies to romanticize or demonize the rich and ancient culture of Tibet.