In the Enlightenment era of the European West, philosophers and theologians such as Thomas Hobbes (1588–1679), Benedict Spinoza (1632–1677), and Richard Simon (1638–1712) began to question the long-established Judeo-Christian tradition that Moses was the author of the first five books of the Bible known as the Pentateuch. Spinoza wrote that Moses could not have written the preface to the fifth book, Deuteronomy, since he never crossed the Jordan River into the Promised Land. There were also other problems such as which references Moses in the third person. According to Spinoza: "All these details, the manner of narration, the testimony, and the context of the whole story lead to the plain conclusion that these books were written by another, and not by Moses in person".