Ancient genetic material extracted from human bones buried in Ireland’s famous Newgrange tomb come from a Neolithic man, likely a king, whose parents were probably brother and sister, according to new research.

The discovery suggests Neolithic Ireland was ruled about 5,000 years ago by an elite dynasty that used incestuous marriage to distinguish themselves from ordinary society — like the pharaohs of ancient Egypt and some Inca royalty in Mesoamerica.



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