Al-Najaf or An-Najaf al-Ashraf, is a city in central Iraq about 160 km south of Baghdad. Its estimated population in 2013 was 1,000,000 people. It is the capital of Najaf Governorate. It is widely considered amongst the holiest cities of Shia Islam and one of its spiritual capitals, whilst also remaining the center of Shia political power in Iraq. It is reputedly the burial place of Muhammad's son in law and cousin, Imam ‘Alī ibn Abī Tālib. It is also the location of the largest cemetery in the world, Wadi-us-Salaam, of one of the most important seminaries in the Shi'i Islamic world, and a major pilgrimage destination for Shia Muslims.