Wikipedia - Nag Hammadi Codices, 1945
The Nag Hammadi library[1] is a collection of Gnostic texts discovered near the Upper Egyptian town of Nag Hammadi in 1945. Twelve leather-bound papyrus codices buried in a sealed jar were found by a local farmer named Mohammed al-Samman.[2][3] The writings in these codices comprised fifty-two mostly Gnostic treatises, but they also include three works belonging to the Corpus Hermeticum and a partial translation/alteration of Plato's Republic. In his "Introduction" to The Nag Hammadi Library in English, James Robinson suggests that these codices may have belonged to a nearby Pachomian monastery, and were buried after Bishop Athanasius condemned the use of non-canonical books in his Festal Letter of 367 AD.
The contents of the codices were written in the Coptic language, though the works were probably all translations from Greek.[4] The best-known of these works is probably the Gospel of Thomas, of which the Nag Hammadi codices contain the only complete text. After the discovery, scholars recognized that fragments of these sayings attributed to Jesus appeared in manuscripts discovered at Oxyrhynchus in 1898 (P. Oxy. 1), and matching quotations were recognized in other early Christian sources. Subsequently, a 1st or 2nd century date of composition circa 80 AD has been proposed for the lost Greek originals of the Gospel of Thomas. The buried manuscripts date from the third and fourth centuries.
The Nag Hammadi codices are housed in the Coptic Museum in Cairo, Egypt. 