The Epistle of Mathetes (meaning "disciple") to Diognetus
The Epistle of Mathetes to Diognetus is an early writing defending Christianity from its accusers. The writer is unknown but is believed to have been written between 130 and 250 AD. The Epistle survived only in one manuscript which was destroyed by fire in 1870. Fortunately, it had already been printed (as early as 1592).