Ross (Ros in Scottish Gaelic) is a region of Scotland and a former earldom and county. The name Ross allegedly derives from a Gaelic word meaning "headland", perhaps a reference to the Black Isle. Another possible origin is the West Norse word for Orkney – Hrossey – meaning horse island; the area once belonged to the Norwegian (West Norse) earldom of Orkney. Ross is a historical comital region, perhaps predating the Mormaerdom of Ross.
Excavations of a rock shelter and shell midden at Sand, Applecross on the coast of Wester Ross have shown that the coast was occupied by Mesolithic hunter-gatherers.
It may be doubted whether the Romans ever effected even a temporary settlement in the area of the modern county. In Roman times, and for long afterwards, the land was occupied by Picts, who, in the 6th and 7th centuries, were converted to Christianity by followers of Saint Columba. Throughout the next three centuries the natives were continually harassed by Norwegian Viking raiders, of whose presence tokens have survived in several place-names (Dingwall, Tain, and others). At this time the country formed part of the great province of Moray (Latin: Moravia), which then extended as far as the Dornoch Firth and the Oykel, and practically comprised the whole of Ross and Cromarty.