In one of his works G. Dumézil has postulated the existence of a structural difference in level between the Indo-European gods of beginning and ending and the other gods who fall into a tripartite structure, reflecting the most ancient organization of society. So in IE religions there is an introducer god (as Vedic Vâyu and Roman Janus) and a god of ending, a nurturer goddess and a genie of fire (as Vedic Saraswati and Agni, Avestic Armaiti, Anâitâ and Roman Vesta) who show a sort of mutual solidarity: the concept of 'god of ending' is defined in connection to the human referential, i.e. the current situation of man in the universe, and not to endings as transitions, which are under the jurisdiction of the gods of beginning owing to the ambivalent nature of the concept. Thus the god of beginning is not structurally reducible to a sovereign god, nor the goddess of ending to any of the three categories on to which the goddesses are distributed. There is though a greater degree of fuzziness concerning the function and role of goddesses, which may have formed a preexisting structure allowing the absorption of the local Mediterranean mother goddesses, nurturers and protectresses .