Ancient Ireland, too: https://www.newscientist.com/article/2246227-stone-age-ruling-elite-in-ireland-may-have-had-incestuous-marriages/ https://www.newscientist

Ancient Ireland, too: https://www.newscientist.com/article/2246227-stone-age-ruling-elite-in-ireland-may-have-had-incestuous-marriages/ https://www.newscientist.com/article/2246227-stone-age-rulin...