Date: 2300 B.C.E.

Although in classical times the philosophical validity of divination came to be questioned, in ancient Mesopotamia the belief in divination is attested by thousands of texts that constitute a permanent record of Mesopotamian interest in omens and respect for the science of interpreting them. Omen collections were viewed as scientific reference works. The collections were edited and organized by being written on a number of clay tablets of specific content that succeeded each other in a certain order to form series.