Lupercus

The Grotto of Lupercus is the oldest sanctuary of kingly Rome.

Faunus is frequently called Inuus or the fertilizer, and Lupercus or the one who wards off wolves.

Lupercus was, primarily, the god of shepherds, said to have been so called because he protected the flocks from wolves.

As such he is akin to or identical with Inuus (“fructifier”) and Lupercus (see Lupercalia).

The Lupercal was the sanctuary of Lupercus ('wolf-repeller'), an old Roman shepherd god.