Chellah, also Shalla, is a medieval fortified Islamic necropolis located in Rabat, Morocco. The Phoenicians established a trading center at the site in the 1st millennium BC. Later the site became an ancient Roman colony in the province of Mauretania Tingitana. During the Almohad era the site was mostly abandoned and then rebuilt by the Marinids in the 13th century AD. The ruins of their medieval fortress are still extant. Chellah was inscribed as a UNESCO World Heritage Site in 2012 as part of Rabat, Modern Capital and Historic City a Shared Heritage.