This 2 book set includes these following titles:
Under Heaven (ISBN 9780451463890):
It begins simply. Shen Tai, son of an illustrious general serving the Emperor of Kitai, has spent two years honoring the memory of his late father by burying the bones of the dead from both armies at the site of one of his father’s last great battles. In recognition of his labors and his filial piety, an unlikely source has sent him a dangerous gift: 250 Sardian horses.
You give a man one of the famed Sardian horses to reward him greatly. You give him four or five to exalt him above his fellows, propel him towards rank, and earn him jealousy, possibly mortal jealousy. Two hundred and fifty is an unthinkable gift, a gift to overwhelm an emperor.
Wisely, the gift comes with the stipulation that Tai must claim the horses in person. Otherwise he would probably be dead already…
River of Stars (ISBN 9780451416094):
Lin Shan is the daughter of a scholar, his beloved only child. Educated by him in ways young women never are, gifted as a songwriter and calligrapher, she finds herself living a life suspended between two worlds. Her intelligence captivates an emperor—and alienates women at the court. But when her father’s life is endangered by the savage politics of the day, Shan must act in ways no woman ever has.
In an empire divided by bitter factions circling an exquisitely cultured emperor who loves his gardens and his art far more than the burdens of governing, dramatic events on the northern steppe alter the balance of power in the world, leading to events no one could have foretold, under the river of stars.