عبد الله الغالب
Ben Youssef Mosque is named after the Almoravid sultan Ali ibn Yusuf, who built the original mosque in the 12th century to serve as the city's main Friday mosque. After being abandoned during the Almohad period and falling into ruin, it was rebuilt in the 1560s by Abdallah al-Ghalib and then completely rebuilt again Moulay Sliman at the beginning of the 19th century. The 16th-century Ben Youssef Madrasa is located next to it. Also next to it is the Koubba Ba’adiyn or Almoravid Koubba, a rare architectural remnant of the Almoravid period which was excavated and restored in the 20th century. The Koubba, a domed kiosk structure, demonstrates a sophisticated style and is an important indication of the art and architecture of the period.