Far Flies the Eagle // Warrior's Mistress — Evelyn Anthony

Imperial Russia's Czar Alexander I battles Napoleon for control of Europe
 
After declaring himself Emperor of France following a sweeping victory in Europe, General Napoleon Bonaparte, the son of a poor Corsican lawyer, is ready for his next conquest. He has no doubt that he can defeat Austria, and is confident that Russia will soon follow. After all, he triumphed in revolution and recast an empire. What has he to fear from the twenty-nine-year-old czar of a barbaric country?
 
The grandson of Catherine the Great, Alexander I is tall, irresistibly handsome, and known for his liberal leanings and winning ways with women who are not his wife. He ascended to the throne by murdering his father and is now determined to vanquish the French emperor. Napoleon will soon learn that he has a formidable adversary in Alexander.
 
Sweeping from St. Petersburg to Paris, from the Kremlin to the battlefield, and filled with historic authenticity, Far Flies the Eagle offers a fascinating glimpse into the Romanov family, including the controversy surrounding Alexander's relationship with his beautiful, power-hungry sister, the Grand Duchess Catherine, whom Napoleon considers marrying if he can rid himself of his years-older wife Josephine.
 
Far Flies the Eagle is the 3rd book in the Romanov Trilogy, but you may enjoy reading the series in any order.