It has been suggested that they would have had a mean population of about 2,000 .
Many would be much smaller than 1,000 and the largest , Edinburgh , probably had a population of more than 10,000 by the end of the era .
It has been suggested that they would have had a mean population of about 2,000 , but many would be much smaller than 1,000 and the largest , Edinburgh , probably had a population of more than 10,000 by the end of the era .