For the purposes of defence. An enemy army cannot invade a city as easily if they are forced to go through the city gates and the invading force can be attacked with projectile weapons from the top of the walls.
The Romans, like everyone else in those days, built walls and fortifications around their towns.
Hadrian
First they sent emissaries around the city-states with god, bribing cites to join with them. Against the hold-outs they advanced by land, with a flanking fleet which threatened the southern Greek city-states, so the cities kept their armies at home defending their walls and so would be unable to unite into a string force, allowing the Persians to take over the cities one by one.
Ancient cities needed organized government because they can't just lay around like pigs. If they were like pigs they wouldn't care if somebody from another place attack and/or kill people. Someone needed to organize things. They organized food for armies, people to build city walls, they trained armies and gave them weapons, clothing, and shelter.
Instead of having walls around them, the Minoans depended on the sea and navy for protection.
They had no walls
they had no walls
Sumerian cities had walls around them for the primary purpose of protection.
build walls around their cities?
Minoan frescoes appear on the walls of homes and palaces, not tombs.
Modern weaponry renders walls useless.
Protection from invaders.
building walls around their cities.
Large walls were built around cities to protect the cities. It took 10,000 workers using 18 years to build that wall. The walls were 30 feet high, 65 feet thick, four and a half miles long. Skilled craft workers lived outside the walls to decorate the walls.
Flight and advanced firearms have essentially made the value of walls as a defensive measure useless.
They started to build strong walls around their cities,that were made of mud bricks that were baked in the sun until they were hard.