XXI-DIANUS AND DIANA. Recapitulation : Rise of sacred kings endowed with magical or divine powers, The King of the Wood at Nemi seems to have personified Jupiter the god of the oak and to have mated with Diana the goddess of the oak, Dianus (Janus) and Diana originally dialectically different forms of Jupiter and Juno, Janus (Dianus) not originally a god of doors, Double-headed figure of Janus (Dianus) derived from a custom of placing him as sentinel at doorways, Parallel custom among the negroes of Surinam, Originally the King of the Wood at Nemi represented Dianus (Janus), a duplicate form of Jupiter, the god of the oak, the thunder, and the sky.