Erulus
Frieze-Dennison Vergil
Erulus , ī, m.: king of Praeneste, and son of Feronia, said to have had three lives, and to have been killed by Evander, 8.563.
Could not find Erulum in Logeion dictionaries.
Erulum Proper-name noun: masculine accusative singular of Erulus
Erŭlus, i, m., v. Herulus.