The Horse Queen. The Aethon Chronicles, #3

An empire in peril. A dangerous task to ensure its survival. Sophia, a young servant-mare, witnesses the horrific downfall her homeland Aethon, conquered by the powerful winged pegasus race. Within a few short years, her sheltered life is shattered when she is taken from her family to the capital city of the Pegasus Empire. There, though urged to conceal her identity, she unwittingly wins the heart of the newly crowned emperor.
Amidst political intrigue and societal barriers, secret plots against the emperor leaves the empire teetering on the brink of collapse. At the same time, a prophecy warning of an enemy seeking the horses' demise lurks into fruition. Sophia will soon face a decision that could save both her loved ones and her kind. But it will cost her own life.