From the mid-seventeenth century, the problem of human sociability, long a staple of natural jurisprudence, became even more central to political thought. Faced with Hobbes's insistence on man's natural unsociability, Protestant thinkers continued to treat the question from within natural law. For reasons we do not yet understand, however, Catholic thinkers did not. Instead, it is argued here, they turned to sacred history, and in particular to the Old Testament, as the earliest record of the formation of human societies, Hebrew and gentile. The materials for this enquiry were provided by new critical scholarship on the Bible and the peoples of the ancient Near East. Despite the hostility of the authorities in Rome to its findings, this scholarship was widely available in the Catholic world, notably so in contemporary Naples. Two of the most remarkable applications of sacred history to the problem of sociability were by the Neapolitans Pietro Giannone, in his ‘Triregno’ (1731–3), and Giambattista Vico, in the Scienza nuova (1725–44). These works explored the ways in which family relations, religious practices, and war enabled the ancient Hebrews and their gentile neighbours to form and maintain societies, notwithstanding the unsocial tendency of human passions.