They learned of their true ancestry after growing to manhood and overthrew Amulius and restored their grandfather Numitor to the throne before deciding to found a new city.

They learned of their true ancestry after growing to manhood and overthrew Amulius and restored their grandfather Numitor to the throne. They then decided to found a new city.

Numitor (their grandfather and king of the ancient Italian city of Alba Longa), was deposed by his brother Amulius and Numitor's daughter, Rhea Silvia, was made a 'Vestal Virgin' by Amulius ...

Amulius sends Rhea away to join the Vestal Virgins, hoping the vow of virginity will keep her from ever producing an heir who would threaten his claim to the stolen throne.

Before the birth of the twins, Numitor was deposed by his younger brother Amulius, who forced Rhea to become a vestal virgin so that she would not give birth to rival claimants to his title.