The "Tell"

 

In general, before the Roman period, a city needed a hill for defense, with a spring nearby. Certain proportions had to be right: the hill had to be small enough so that the population supplied by the spring would suffice to produce enough soldiers to defend a wall surrounding the hill. You needed enough good agricultural land to feed that population. (You also needed peasants in nearby villages to work the land – about ten for every aristocrat in the city.) If you wanted to engage in commerce, you had to be near a decent road. Only certain hills fulfilled these requirements, and therefore people kept building on them. That is why we find layer after layer on some few hills, called tells, while others remained unsettled .