Being the first mosque built after the conquest of Istanbul, the great Mosque of Eyüp lies outside the city walls in Eyüp district. It is located near the Golden Horn, at the supposed place where Eyüp, the standard bearer of the Prophet Muhammed, died in the Islamic assault on Constantinople in 670. Abu Ayyub al-Ansari, who hosted the Prophet Muhammad in his house when he moved from Mecca to Medina, is supposed to be entombed in it. Even though today this mosque has gained significant importance and is considered as the second place of pilgrimage for Muslims after Mecca, it does not serve as a real pilgrimage place in Islam.