Dr Peter Williams examines the authenticity of the Gospel witnesses in this lecture: The authorship of the first four books of the New Testament has fascinated scholars for centuries. If the authors were eyewitnesses, one could assume greater reliability. If not, then questions are naturally raised about the historicity of details in the writings. Because the first three Gospels are so similar, many theories have been proposed and argued to explain the sources of verbatim sections, as well as the unique material. Did Mark rely on Peter for eyewitness details? Luke admits his use of other sources, but did he use Mark or Matthew or both? What about Matthew and John?