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The use of capital punishment against Christians was an important feature of early Islamic history, but it was limited in its scope and aimed at two specific goals. The first was to establish the primacy of Islam and the Islamic character of the state at a moment when Muslims were dramatically outnumbered by their non-Muslim subjects. In this world, public executions had a performative function and were designed to instill obedience in the massive and potentially recalcitrant non-Muslim population. The second was to forge boundaries between groups at a time of unprecedented social and religious mixing. Indeed, Muslims and Christians interacted with each other in the most intimate of settings, from workshops and markets to city blocks and even marital beds. Not surprisingly, these interactions gave rise to overlapping practices, including behaviors that blurred the line between Christianity and Islam. To ensure that conversion and assimilation went exclusively in the direction of Islam, Muslim officials executed the most flagrant boundary-crossers, and Christians, in turn, revered some of these as saints.
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Christian C. Sahner (Christian Martyrs under Islam: Religious Violence and the Making of the Muslim World)