Clement of Alexandria
Titus Flavius Clemens (Clement of Alexandria), an early Christian theologian, made use of an open canon. In addition to books that did not make it into the final 27-book New Testament but which had local canonicity (Barnabas, Didache, I Clement, Revelation of Peter, the Shepherd, the Gospel according to the Hebrews), he also used the Gospel of the Egyptians, Preaching of Peter, Traditions of Matthias, Sibylline Oracles, and the Oral Gospel. He did, however, prefer the four church gospels to all others, although he supplemented them freely with apocryphal gospels. He was the first to treat non-Pauline letters of the apostles (other than II Peter) as scripture-he accepted I Peter, I and II John, and Jude as scripture.