Fortune's Child - Martin James Conroyd

From a very young age, Theodora, daughter of a circus bearkeeper in Constantinople, sets her sights well above her station in life. Her exquisite beauty sets her apart on stages and in the eyes of men.
Stephen, a Syrian lad of striking good looks, is sold by his parents to a Persian wizard, who teaches him a skill in languages that will serve him well.
By the time Destiny brings them together in Antioch, Theodora has undergone heartrending trials and a transformation, while Stephen has been sold again . . . and castrated.
Discover the enduring bond that, however imperfect, prompts Theodora—as Empress—to request palace eunuch Stephen to write her biography.

Martin's 'settings and characters come to life in meticulously researched detail. I felt like I was there.' —Lisa Wingate, New York Times Bestselling Author of Before We Were Yours