A Dictionary of Greek and Roman biography and mythology

the son of Aruns, who was the brother of L. Tarquinius Priscus [ARUNS, No. 1], was born after the death of his father; and as Demaratus, the father of Aruns, died shortly after the death of his son without knowing that his daughter-in-law was pregnant, none of his property was left to Egerius, from which circumstance, according to the legend, he derived his name. When the town of Collatia was taken by his uncle Tarquinius Prisons, Egerius was left in command of the place, and henceforth received, according to Dionysis, the surname of Collatinus thoughh this name is usually confined to his son L. Tarquinius Collatinus). Egerius was afterwards sent against Fidenae in command of the allied forces of Romie. [COLLATINUS.] (Liv. 1.34, 38; Dionys. A. R. 3.50, 57, comp. 4.64.)