The descendants of Aeneas and Lavinia's son Silvius will rule as kings over Alba Longa. The last of them, Numitor, will have a daughter Ilia (or Rhea Silvia) who will give give birth to twins, Romulus and Remus. Mars the god of war will be their father.
Romulus will found a city on seven hills, whose authority will extend the length and breadth of the earth.