Saint Francis of Assissi had a <em>personal experience</em> with God, resulting in his <em>conversion, salvation and a life devoted to serving God</em> and the people in a different way from the traditional church. He practiced what Jesus taught in the Scriptures, in simplicity and sincerity, and he expected that his fellow disciples did the same to spread the gospel. This had a tremendous impact on people's lives.
For something to be prehistoric it has to be before the times that record history. The Sumerians had written laws so they are not prehistoric because they record history.