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The complete story talks of the coming of the Vikings.

"What happened to the previous inhabitants we do not know but recent research suggests that many of the Norse incomers took local wives."

This is unlikely. Agriculture was the work of slaves from the beginning until very recently. Saint Patrick was captured on an Irish slave raid and was captive for ten or twenty years. The Roman economy was based on captured slave labor. The "cattle raids" so talked about in the old chronicles were slave raids as well. Serfdom lasted into modern times. Slavery was considered as normal as eating breakfast pretty much everywhere until the 19th Century.

What happened to the aboriginal people when the Vikings took over? They were made slaves, of course. That is they were made slaves if they were cooperative, productive, and cheerful and especially if they were young and pretty.