Milk was unusual as a libation at Rome, but was regularly offered to a few deities, particularly those of an archaic nature or those for whom it was a natural complement, such as , a goddess of birth and childrearing who promoted the flow of breast milk, and Cunina, a tutelary of the cradle. It was offered also to Mercurius Sobrius (the "sober" Mercury), whose cult is well attested in Roman Africa and may have been imported to the city of Rome by an African community.