Portumnus, in Roman folklore, is originally the god of gates and doors (Lat. porta), and as such identified with Janus and represented with a key in his hand.
He is also assoiated with keys, livestock, fords and possibly warehouses...
With the introduction of the Greek gods, he became conflated with Palaemon, and evolved into a god primarily of ports and harbors...
Portumnes can appear as a man (possibly two-headed) with a key in his hand.
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