Prologue -- Retracing history. To the Metropolitan Museum of Art from Paris -- Sojourn in Paris -- Acquired on Mount Athos by Constantin Erbiceanu -- In the possession of Chrysanthos, Patriarch of Jerusalem -- Earlier users leave their marks -- Reconstructing use. The Gospel lectionary in Byzantium -- Using the Jaharis Lectionary -- The Jaharis Lectionary Menologion -- Lectionaries for Hagia Sophia and the Patriarchate -- The "Taxis and Akolouthia for September 1" -- Constantinopolitan and patriarchal indicators -- Uncorrected mistakes in the Menologion of the Jaharis lectionary -- Exploring manufacture. Materials and craftsmanship -- Evangelist portraits -- Binding and flyleaves -- Contextualizing production. Summary of decorative schemes in gospel lectionaries related to the Jaharis lectionary, circa 1100 -- Explanations for difference