Was an Etruscan (The Etruscans had been gaining power and were an up and coming civilization.)
When he and his wife, Tanaquil, first came to Rome an eagle took the hat off his head and then replaced it. Tanaquil would later use this as an omen foretelling of his divine right to power.
Doubled the size of the cavalry.
Possibly started the Temple of Iupiter Capitolinus