The earliest historical source we have comes from around the 10th century and held that the Gaels came from Ireland in around 500 AD, under King Fergus Mor, and conquered Argyll from the Picts.

The politcal map was altered. The Picts, Gaels and many Britons were freed from Northumbrian overlordship. Gaelic poets as far away as Ireland celebrated the battle's outcome. The Pictish frontier ...