Helernus, also known as Alernus, was an Archaic Roman deity.[1] He was a minor god of the underworld, and god of the beans used during the Lemuria festival during May.[2] His sacred grove (lucus) was near the mouth of the Tiber river.[3] Sacrifices were made to him annually on 1 February by the Roman Pontiffs, in which a black ox was killed.[a][1][5] He had one daughter, named Carna, who was goddess of protecting the intestines of children from vampires.[2]
Poultney and others compare Helernus with the similarly (apparently) chthonic deity Hule/Horse/Huřie who shows up a couple times in the Umbrian Iguvine Tablets. [6]
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