Arruns Tarquinius, commonly called Egerius, was a member of the royal family of early Rome. His father was Arruns Tarquinius, son of Demaratus of Corinth. Demaratus had settled at Tarquinii during the seventh century BC, and married an Etruscan noblewoman. They had two sons, Lucius and Arruns. Arruns died shortly before his father, leaving his wife pregnant. Not knowing of his grandson, Demaratus left him no inheritance, and so Arruns was born into poverty despite his grandfather's wealth. For this reason, the child was called Egerius, meaning "the needy one."