THE CHURCH OF SS. PETER AND MARK, HOJA ATIK MUSTAPHA JAMISSI The Byzantine church, now Hoja Atik Mustapha Jamissi, situated in the Aivan Serai quarter, close to the Golden Horn, is commonly regarded as the church of SS. Peter and Mark, because it stands where the church dedicated to the chief of the apostles and his companion stood, in the district of Blachernae (Aivan Serai) and near the Golden Horn.[305] Such indications are too vague for a positive opinion on the subject, but perhaps the Patriarch Constantius, who is responsible for the identification, may have relied upon some tradition in favour of the view he has made current.[306] NOTE Tafferner, chaplain to the embassy from Leopold I. of Austria to the Ottoman Court, speaking of the patriarchal church in his day (the present patriarchal church of S. George in the Phanar quarter), says, 'Aedes haec in patriarchatum erecta est, postquam Sultan Mehemet basilicam Petri et Pauli exceptam Graecis in moscheam defoedavit' (_Caesarea legatio_, p. 89, Vien. 1668). Probably by the church of SS. Peter and Paul he means this church of SS. Peter and Mark. If so, the traditional name of the building is carried back to the seventeenth century. The church of SS. Peter and Mark, it is true, never served as a patriarchal church. That honour belonged to the church of S. Demetrius of Kanabos, which is in the immediate vicinity, and has always remained a Christian sanctuary. Tafferner seems to have confused the two churches owing to their proximity to each other. Or his language may mean that the patriarchal seat was removed from S. Demetrius when SS. Peter and Paul was converted into a mosque, because too near a building which had become a Moslem place of worship. The church of SS. Peter and Mark was founded, it is said, by two patricians of Constantinople, named Galbius and Candidus, in 458, early in the reign of Leo I. (457-474). But the present building cannot be so old. It is a fair question to ask whether it may not be the church of S. Anastasia referred to in a chrysoboullon of John Palaeologus (1342), and mentioned by the Russian pilgrim who visited Constantinople in the fifteenth century (1424-53).[307]