The Sultan's Wife
Jane Johnson

Alys Swann is also a captive, but hers is a different lot: convert to Islam, marry the sultan and give him sons. Or die. Nus-Nus, the sultan’s scribe and keeper of the royal couching book, is charged with convincing Alys to accept her fate. Or they both die. Two powerless prisoners in a world of brutal intrigue, each discovers that they can take strength in the other, to endure that which must be endured in the hope of a better tomorrow.
Rich in detail with compelling characters and an ambitious scope, The Sultan’s Wife is a remarkable tale of adventure, romance, history, and friendship.