The Promise (2006)

A beautiful princess has three men fall in love with her: a general, his slave, and a rival Duke. Unbeknownst to the men, the princess made a pact with a goddess in her youth where she forsook the prospect of true love for the promise of riches and power. Any man she loves, she will lose, a bargain which has hitherto born no consequence for the princess, as haughty as she is lovely.

But when a slave -- disguised as a mighty general -- defends first her honor and then her life with unflinching valor, the princess feels something stir within her for the first time. With the awakening of passion, she realizes with dread what destiny holds for her.

Enslaved to the fate that has befallen them, only the truest love of all can alter the course of their destiny...