With an expanding population and an awareness of how valuable was good urban planning, the
Abbasids built a number of towns and cities where special attention was given to communications and transport routes. While the Aghlabid rulers of Ifriqiya built Raqqada – a town some 8 km from Kairouan – to house their palaces, parks and gardens; further east in
Abbasid Syria, new housing developments were developed in Kharab Sayyar – a fortified town on the main route between al-Raqqa and Mosul in Iraq.