An ancient people who lived in eastern-northeastern Scotland, known as the "Painted People" probably referring to a custom of body painting or tattooing. Probably descendants of pre-Celtic aborigines or from the Bay of Biscay where they had helped Caesar defeat the Veneti the Picts were described in 297 AD by a Roman writing of the "Picts and Irish [Scots] attacking" Hadrian's Wall. They were the principal enemies of Rome in north Britain. Then or soon after they developed two kingdoms north of the Firth of Forth which became a united "Pict-land" by the 7th century. In 843 Kenneth I MacAlpin king of the Scots became also king of the Picts uniting their two lands in a new kingdom of Alba which evolved into Scotland. The Pictish kingdom is known for its symbol stones and crosses. Their name for themselves was Cruithni. There is little archaeological material which can be confidently attributed to the Picts except for the symbol stones.