SummaryRecent genomic analyses show that the earliest peoples reaching Remote Oceania – associated with Austronesian-speaking Lapita culture – were almost completely East Asian, without detectable Papuan ancestry. Yet Papuan-related genetic ancestry is found across present-day Pacific populations, indicating that peoples from Near Oceania have played a significant – but largely unknown – ancestral role. Here, new genome-wide data from 19 South Pacific individuals provide direct evidence of a so-far undescribed Papuan expansion into Remote Oceania starting ~2,500 years before present, far earlier than previously estimated and supporting a model from historical linguistics. New genome-wide data from 27 contemporary ni-Vanuatu demonstrate a subsequent and almost complete replacement of Lapita-Austronesian by Near Oceanian ancestry. Despite this massive demographic change, incoming Papuan languages did not replace Austronesian languages. Population replacement with language continuity is extremely rare – if not unprecedented – in human history. Our analyses show that rather than one large-scale event, the process was incremental and complex, with repeated migrations and sex-biased admixture with peoples from the Bismarck Archipelago.

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Christian missions are often characterized as a physical expression of Western colonial power, institutions that were resisted by indigenous people in various ways. In Vanuatu, while there was indeed dramatic resistance to mission incursion, the success of Christianity in many places (for not everyone converted) developed from a series of complex entanglements between indigenous Melanesians and Christian missionaries. This is apparent in oral traditions and in the physical remains relating to mission encounters. Indigenous ni-Vanuatu see the archaeological remains of mission sites as an integral part of their heritage, rather than as relics of a foreign colonial past. This tendency relates to other aspects of missionary heritage as well, including museum collections and sacred texts. The historical archaeology of missions in Vanuatu and beyond can be best understood through the lens of colonial entanglement, destabilizing categorical oppositions such as colonizer-colonized, foreign-indigenous, and power-resistance.