Hejaz is the birthplace of Islam and the kingdom is sometimes called "the Land of the Two Holy Mosques" in reference to Al-Masjid al-Haram (in Mecca), and Al-Masjid al-Nabawi (in Medina), the two holiest places in Islam. Mecca, the capital of Hejaz, is also the seat for the Sharifian Caliphate, the most supreme religious and political authority among the Sunni Muslim community worldwide.