Polynesians come from Austronesians, who came out of what's now Taiwan. Polynesians moved on to take over most of the Pacific. Back home, however, Vanuatu's Polynesians got replaced by Papuans. They kept their language however, suggesting that those incoming Papuans may well have mixed with Polynesians. Lately the Turtle is looking at "Wallacea".
Wallacea is on the east side of the Wallace Line - and west of the Lydekker Line. That is the strait between Sunda (when Borneo and Java were Southeast Asian) and Sahul (when New Guinea was Australian). The mainstays of Wallacea are Sulawesi and Timor.
Sulawesi, and eventually Timor, got peopled by the oldest humans in the region: the same lot as the Australians and Papuans. There they stayed. Until, we are told now, some coastal Papuans learnt to boat. They got that by merging with Austronesians around 1500 BC.
This means genetics of Timor after 1500 BC don't much help before that year, requiring preservation between the monsoons they get.
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