The manuscript first came to scholarly attention two hundred years ago this year, when it was presented to a British dignitary on the Greek island of Zakynthos. On the face of it, the manuscript is a lectionary containing the portions of the gospels used in Christian worship throughout the year. However, this twelfth-century document is a palimpsest, created by erasing the ink from an earlier manuscript in order to re-use the parchment to make another book. The original text is a commentary on the Gospel according to Luke known as a catena, bringing together extracts from early Christian writers which explain the biblical text. However, given the overwriting of the manuscript and the fading of the ink, much of the commentary is unreadable to the naked eye.