Some fragmentary verses that do not appear in the collections that survive are only known because they were quoted by a Church Father. Justin Martyr (ca. 150), if he is truly the author of the "Hortatory Address to the Greeks," gives such a circumstantial account of the Cumaean sibyl that the "Address" is quoted here at the Cumaean sibyl's entry. The "Catholic Encyclopedia" states, "Through the decline and disappearance of paganism, however, interest in them gradually diminished and they ceased to be widely read or circulated, though they were known and used during the Middle Ages in both the East and the West." Thus, a student may find echoes of their imagery and style in much early medieval literature.