The Prophet's Mosque (Arabic: المسجد النبوي Al-Masjid Al-Nabawi) in Medina, Saudi Arabia, is the second holiest mosque in Islam after Masjid al-Haram in Mecca and before the Al-Aqsa Mosque (next to the Dome of the Rock), in Jerusalem.
The original mosque was built by Muhammad. Subsequent caliphs enlarged it and improved its decoration. The first building was not large and represented only a small part of the area of the current building. The size of the mosque has been significantly increased since the formation of the Saudi kingdom. The last renovation took place under King Fahd.