The prehistory of Ireland has been pieced together from archaeological and genetic evidence; it begins with the first evidence of humans, Mesolithic hunter-gatherers, settling in Ireland after 8000 BC and finishes with the start of the historical record, around 400 AD. The prehistoric period covers the Mesolithic, Neolithic, Bronze Age and Iron Age societies of Ireland. For much of Europe, the historical record begins when the Romans invaded; as Ireland was not invaded by the Romans its historical record starts later, with the coming of Christianity. The first settlement in Ireland was found in the middle of Derry (Mount Sandel). Here they found stone tools and wattle and daub houses