Click and drag the map above. Use the buttons to zoom in and out. The old kingdoms are indicated by blue lettering. The baronies (also showing older territories) are in white. Surnames, in their commonly used forms, are shown in black. Each name has a long association with the locality shown, during either the medieval period or in more recent times. In some cases different septs using the same surname arose in widely different areas. In other cases migration due to war dispersed them.