Nag Hammadi codices. Discovered in a clay jar in Egypt in 1945. The codices were eventually discovered to be secret sacred Christian texts. The books were created over 1,500 years ago, during the first centuries of Christianity. Some of them had never been mentioned before, in any Christian literature; others had been declared heresy, and banned by the Church. They offer a counter-point to accepted ecclesiastical literature, and have been controversial ever since their discovery.
Also known as the Nag Hammadi library, the Gnostic Gospels are a collection of leather-bound books that date back to the 4th century. They make up the major texts of Gnosticism, an offshoot of Christianity that existed around the time of the 2nd century, adherents are believe that salvation comes through deep self-knowledge and an understanding of a “higher reality.” The Gnostic Gospels, feature such volumes as “The Gospel of Thomas,” “The Gospel of Mary,” and even the Gospel of Judas.
The Templars reference to the Holy Grail, were in fact 13 ancient leather bound books (discovered in 1947), that could be the word of Christ. Jesus taught Gnosticism to his selected followers and spoke in parables to the crowds. These 13 codices are referred to as "The Jesus Gospels", "The Gnostic Gospels" or the Nag Hammadi Library and date from the first 2 or 3 centuries of the Christian era.