Al-Najaf (ٱلنَّجَف) or An-Najaf al-Ashraf (ٱلنَّجَف ٱلْأَشْرَف), Baniqia ( ܒܐܢܩܝܐ), is a city in central Iraq about 160 km (99 mi) 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. According to Ibn al-Manzur, the word, "najaf" (نجف), literally means a high and rectangular place around which water is accumulated, although the water does not go above its level. Al-Shaykh al-Saduq appeals to a hadith from Imam al-Sadiq, claiming that "Najaf" comes from the phrase, "nay jaff" which means "the nay sea has dried" which gradually changed into "Najaf". "Najaf" is usually accompanied with the adjective, "al-Ashraf" (dignified). According to the author of al-Hawza al-'ilmiyya fi l-Najaf al-ashraf, this is because Imam 'Ali, one of the most dignified persons, is buried in the city. Al-Ghari or al-Ghariyyan, Hadd al-'Adhra', al-Hiwar, al-Judi, Wadi l-Salam, al-Zahr, Zahr al-Kufa (behind Kufa), al-Rabwa, Baniqiya, and Mashhad are other names for this land. The area of An-Najaf is located 30 km (19 mi) south of the ancient city of Babylon, and 400 km (248 mi) north of the ancient city of Ur. The city itself was founded in 791 [AD], by the Abbasid Caliph Harūn ar-Rashīd, as a shrine to ‘Alī bin Abī Ṭālib. Archaeological discoveries show the existence of a populace dating back to the 1st century BC. Najaf possesses one of the largest burial grounds in the vicinity for Christians. The centuries following have proven this to also be a city with a multicultural and religious people.