Casablanca retains many authentic examples of traditional Moroccan architecture, particularly within the city walls of the historic Medina of "Ad-Dār Al-Bayḍāʾ". There are a number of "aḍriħa" (mausolea) including those of Sidi Allal al-Qairawani and Sidi Belyout. Casablanca was one of a number of cities—including Essaouira, Marrakesh, and Rabat—that were revitalized after the earthquake of 1755, by Sultan Mohammed ben Abdallah—who Abdallah Laroui called "the architect of modern Morocco." The sultan was known to have used European architects, such as Théodore Cornut and Ahmed el Inglizi, in his projects. The "Sqala" bastion and the two oldest mosques in the city, the Mosque of the Makhzen and the Walad al-Hamraa Mosque, were built during Sultan Muhammad Ben Abdallah's renovations to the city.