The al-Hussein Mosque or al-Husayn Mosque, also known as the Mosque of al-Imam al-Husayn and the Mosque of Sayyidna al-Husayn, is a mosque and mausoleum of Husayn ibn Ali, originally built in 1154, and then later reconstructed in 1874. The mosque is located in Cairo, Egypt, near the Khan El-Khalili bazaar, near-by the famous Al Azhar Mosque, in an area known as Al-Hussain. It is considered to be one of the holiest Islamic sites in Egypt. Some Shias believe that Husayn's head is buried on the grounds of the mosque where a shrine currently stands.