Even by modern standards, the Empress Theodora (?-548) had a remarkable rise to power. Born into the lowest class of Byzantine society, she worked as an actress in burlesque theater. Yet she attracted the love of the future emperor Justinian, who, to the astonishment of proper society, made her not only his wife but also his partner in government. Justinian's respect for and trust in Theodora gave her power in her own right unmatched by almost any other Roman or Byzantine empress.

In this book, James Allan Evans provides a scholarly, yet highly accessible account of the life and...