In
Vergil's ''
Aeneid
The ''Aeneid'' ( ; or ) is a Latin Epic poetry, epic poem that tells the legendary story of Aeneas, a Troy, Trojan who fled the Trojan War#Sack of Troy, fall of Troy and travelled to Italy, where he became the ancestor of the Ancient Rome ...
'', Erulus is a king of
Praeneste. At birth, he was given three souls (''animae'') by his mother, the goddess
Feronia, who also tripled his ability to defend himself by giving him three sets of arms.
Vergil tells his story through the
Arcadian king
Evander, founder of
Pallantium, who allies with the
Trojan immigrants led by
Aeneas
In Greco-Roman mythology, Aeneas ( , ; from ) was a Troy, Trojan hero, the son of the Trojan prince Anchises and the Greek goddess Aphrodite (equivalent to the Roman Venus (mythology), Venus). His father was a first cousin of King Priam of Troy ...
. Evander regrets that the frailty of old age keeps him from fighting at Aeneas's side, and reminisces about the warrior deeds of his youth:

No other literary source mentions Erulus; he may be Vergil's pure invention, based on the mythological figure
Geryon, or given that
his mother's cult is represented only sparsely in literary sources, he may belong to an archaic tradition to which no other reference survives. Some scholars have seen Erulus as an influence on
Spenser's conception of Triamond's three-fold life in ''
The Faerie Queene
''The Faerie Queene'' is an English epic poem by Edmund Spenser. Books IIII were first published in 1590, then republished in 1596 together with books IVVI. ''The Faerie Queene'' is notable for its form: at over 36,000 lines and over 4,000 sta ...
''.
[Alastair Fowler, ''Spenser and the Numbers of Time'' (Routledge, 1964), p. 28, note ]
online.
/ref>
References
{{Reflist
Kings in Roman mythology
Characters in the Aeneid