The chance discovery of a unique unpublished nineteenth-century photograph in the archive of the BSA has led to the re-discovery of one of the lost Byzantine churches of Constantinople. The church, known as the Seyh Murad Mescidi, was destroyed by 1880, and is preserved only through two lithographs and descriptions. These sources are re-accessed in the light of the BSA photograph, and a Comnene date for the main part of the building is proposed, with Palaeologan additions. Previous attributions concerning the church's Byzantine dedication are examined and found wanting. An alternative dedication, to the Prophet Elisha, is suggested.
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