Emerging from the boulevards of the Ville Nouvelle (New Town) of Rabat one comes across the ruins of Chellah, once the thriving walled Roman port city of Sala Colonia, abandoned in 1154 in favour of Sale across the other side of the river mouth. In the time of the Almohads the site was used as a royal burial ground. The Merenid Sultan Abou El Hassan added some monuments and the striking main gate during his reign in the mid-14th century. Just inside the gate are the Roman ruins dating from 200 BC, which includes a forum, a temple and a craftsmen's quarter.