The origins and date-of-origin of matrilineal descent in Judaism are uncertain. Orthodox Jews, who believe that matrilineality and matriarchy within Judaism are related to the metaphysical concept of the Jewish soul, maintain that matrilineal descent is an Oral Law from at least the time of the Receiving of the Torah on Mt. Sinai (c. 1310 BCE). Conservative Jewish Theologian Rabbi Louis Jacobs suggests that the marriage practices of the Jewish community were re-stated as a law of matrilineal descent in the early Tannaitic Period (c. 10-70 CE).