Mincéirs are a nomadic people in Ireland. Many different theories have been put forward to explain the origins of Ireland's itinerant population. It has been suggested Travellers are related to Romani due to a similarly itinerant lifestyle, but genetic testing has shown no evidence for a recent ancestral component between Irish Travellers and Romani Travellers. One idea is of their being distantly related to a Celtic group that invaded Ireland. Another theory is of a pre-Gaelic origin, where Travellers are descended from a community that lived in Ireland before the arrival of the Celts. Once Ireland was claimed as Celtic, this group was seen as lower class. There is also a theory that an indigenous, itinerant community of craftsmen are the ancestors of Travellers, and they never settled down like the Celts. Other speculations on their origin are that they were descended from those Irish who were made homeless during the Cromwellian conquest in the 1650s, or made homeless in either the 1741 or the 1840s famine due to eviction.