Janus

Definition and stakes

Portrait of James George Frazer James George Frazer,  The Golden Bough (1922)

“ If there is any truth in this conjecture, it may explain very simply the origin of the double head of Janus, which has so long exercised the ingenuity of mythologists. When it had become customary to guard the entrance of houses and towns by an image of Janus, it might well be deemed necessary to make the sentinel god look both ways, before and behind, at the same time, in order that nothing should escape his vigilant eye. For if the divine watchman always faced in one direction, it is easy to imagine what mischief might have been wrought with impunity behind his back. ”
Source: Wikisource

E. M. Berens,  Myths and Legends of Ancient Greece and Rome

“ Janus is usually represented with two faces; in his special function as door-keeper of heaven he stands erect, bearing a key in one hand, and a rod or sceptre in the other.
It is supposed that Janus was the most ancient king of Italy, who, during his life, governed his subjects with such wisdom and moderation that, in gratitude for the benefits conferred upon them, his people deified him after death and placed him in the foremost rank among their divinities.
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Source: Gutenberg

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