Books in the Oath of Empire, 2 series

The Gate of Fire continues Tom Harlan's remarkable fantasy epic, following the increasingly dangerous conflicts both military and sorcerous in an alternate ancient Roman Empire. The sorcerer Dahak plots from his hidden citadel to regain the Peacock Throne. Prince Maxian, having raised both Julius Ceasar and Alexander the Great from the dead, now considers how to use them to free Rome from the curse of the Oath. Thyatis has fled with the widowed Queen of Persia to a hidden island; Dwyrin's thaumaturgic unit is shattered as Zoe discovers the destruction of Palmyra and, as its new queen, vows revenge against Rome. And in Mecca, Ahmet's friend and Palmyra's lieutenant Mohammed receives a vision, and a command, and the power to strive against the forces of darkness.