Mecca scholarship governed by the Hashemite Sharifs. In 930, Mecca was attacked and sacked by Qarmatians, a millenarian Ismaili Muslim sect led by Abū-Tāhir Al-Jannābī and centered in eastern Arabia. The Black Death pandemic hit Mecca in 1349. In 1517, the Sharif, Barakat bin Muhammed, acknowledged the supremacy of the Ottoman Caliph but retained a great degree of local autonomy. In 1803 the city was captured by the First Saudi State, which held Mecca until 1813. This was a massive blow to the prestige of the (Turkish) Ottoman Empire, which had exercised sovereignty over the holy city since 1517. The Ottomans
Mecca infrastructure, home to structures such as the Abraj Al Bait, also known as the Makkah Royal Clock Tower Hotel, the world's fourth tallest building and the building with the third largest amount of floor area. During this expansion, Mecca has lost some historical structures and archaeological sites, such as the Ajyad Fortress. Today, more than 15 million Muslims visit Mecca annually, including several million during the few days of the Hajj. As a result, Mecca has become one of the most cosmopolitan cities in the Muslim world, although non-Muslims are prohibited from entering the city. "Mecca" is the familiar form