There are 4 books in the Empress of Rome series. The newest book is Lady of the Eternal City which came out in 2015.

1
Mistress of Rome

Book cover of Mistress of Rome
The first in an unforgettable historical saga from the New York Times bestselling author of The Alice Network and The Diamond Eye.

"So gripping, your hands are glued to the book, and so vivid it burns itself into your mind's eye and stays with you long after you turn the…
When you buy books, we may earn a commission that helps keep our lights on (or join the rebellion as a member).

2
Daughters of Rome

Book cover of Daughters of Rome
A fast-paced historical novel about two women with the power to sway an empire, from the New York Times and USA Today bestselling author of The Alice Network and The Diamond Eye.

A.D. 69. The Roman Empire is up for the taking. Everything will change—especially the lives of two sisters…

3
Empress of the Seven Hills

Book cover of Empress of the Seven Hills
A tale of love, power and intrigue from the New York Times and USA Today bestselling author of The Alice Network and The Diamond Eye.

Powerful, prosperous, and expanding ever farther into the untamed world, the Roman Empire has reached its peak under the rule of the beloved Emperor Trajan.…

4
Lady of the Eternal City

Book cover of Lady of the Eternal City
From the New York Times and USA Today bestselling author of The Alice Network and The Diamond Eye comes a historical saga about obsession, betrayal, and destiny. 
 
Sabina may be Empress of Rome, but she still stands poised on a knife’s edge. She must keep the peace between two deadly…