The Sinope Gospels, designated by O or 023 (in the Gregory-Aland numbering), ε 21 (Soden), also known as the Codex Sinopensis, is a fragment of a 6th-century illuminated Greek Gospel Book. Along with the Rossano Gospels, the Sinope Gospels has been dated, on the basis of the style of the miniatures, to the mid 6th-century. The Rossano Gospels, however are considered to be earlier. Like Rossanensis and the Vienna Genesis, the Sinope Gospels are written on purple dyed vellum.