Al-Masjid an-Nabawī, known in English as the "Prophet's Mosque", is the second mosque built by the Islamic prophet Muhammad in Medina, after that of Quba, as well as the second largest mosque and holiest site in Islam, after Masjid al-Haram in Mecca, in the Saudi region of the Hejaz. The mosque is located at the heart of Medina, and is a major site of pilgrimage that falls under the purview of the Custodian of the Two Holy Mosques.