The name "Mazar-i-Sharif" means "Tomb of the Prince", a reference to the large, blue-tiled sanctuary and mosque in the center of the city known as the Shrine of Ali or the "Blue Mosque". Some people believe that the tomb of Ali ibn Abi Talib, the cousin and son-in-law of the Islamic prophet Muhammad, is at this mosque in Mazar-i-Sharif, after Ali's remains were transferred to Mazar-i-Sharif as per request of Ja'far as-Sadiq. This is however rejected by other Muslims, as the majority believe he is buried in Najaf, Iraq.