 Based on medieval traditional accounts and the apparent evidence from linguistic geography, Gaelic has been commonly believed to have been brought to Scotland, in the 4th–5th centuries CE, by settlers from Ireland who founded the Gaelic kingdom of on Scotland's west coast in present-day Argyll.An alternative view has recently been voiced by archaeologist Dr. Ewan Campbell, who has argued that the putative migration or takeover is not reflected in archeological or placename data (as pointed out earlier by Leslie Alcock).Campbell has also questioned the age and reliability of the medieval historical sources speaking of a conquest.