In Istanbul, there are 29 tombs that are believed to belong to sahabes (the Companions of the Prophet). However, only two of them are real. The others are the symbol tombs (Makam Tombs). Eyup Sultan in Eyup district and Ebu Seybe El-Hudri, who is the foster brother of Prophet Muhammad in Ayvansaray district. Seven of the tombs are in Eyup, 19 are within the old city walls, and three are in Karakoy. Only Ebu Derda has 2 tombs, one in Eyup and the second one in the Uskudar district.