Modern scholars increasingly see the completed Torah as a product of the time of the Achaemenid Empire (probably 450–350 BCE), although some would place its production in the Hellenistic period (333–164 BCE) or even the Hasmonean dynasty (140–37 BCE).[7] Of its constituent sources, Deuteronomy is generally dated between the 7th and 5th centuries;[8] there is much discussion of the unity, extent, nature, and date of the Priestly material.[9] Deuteronomy continues to be seen as having had a history separate from the first four books, and that this historigraphic tradition is continued with the books of Joshua, Judges, Samuel, and Kings as Deuteronomistic history. There is a growing recognition that Genesis developed apart from the Exodus stories until joined to it by the Priestly writer.[10]