Is it true or false that Rome was built on a series of seven steep hills?

True. Rome was indeed built on a series of seven hills, which are traditionally known as the Seven Hills of Rome: Aventine, Caelian, Capitoline, Esquiline, Palatine, Quirinal, and Viminal. These hills played a significant role in the city's early development and defense. The geographic features contributed to Rome's strategic advantages in ancient times.