 Communication with the outside world on the land side was maintained with the city through two main well-protected city gates, one placed on the western side of the city and the other placed on the eastern side. These entrances were constructed so that communications with the city could not be carried out directly; the messenger had to enter through multiple doors and walk down a winding passageway, which is evidence of the security measures taken as a last defense against the possibility of a surprise breach or entrance of unexpected visitors.
