Rome itself effectively didn’t have walls during its peak (the city expanded well past the old walls and they weren’t really maintained). IIRC same applies to m

Rome itself effectively didn’t have walls during its peak (the city expanded well past the old walls and they weren’t really maintained). IIRC same applies to many other Roman cities which weren’t close to the borders or in less safe areas. Knossos or other Minoan cities didn’t have walls either. Sure they were in an island but Crete is large enough for there to be enough opportunities for large scale internal conflicts, yet it implies that their societies were relatively peaceful.