English
This paper deals with the Medieval sources concerning the relics worshipped in the Pharos Chapel, the private church of the Basileus in the Imperial Palace of Constantinople. It especially focus on an hitherto neglected source by Leo Tuscus, a Pisan writer who made an accurate description of the church and witnessed the specific veneration for an image of the Mother of God "Oikokyra", perceived as supernatural defender of the Imperial House.