Firebird (Apocalypto)

A hundred years after humanity destroyed the world and the gods restored it, Mallory of Settlement 20, born to poverty and hunger, is chosen to join the chalices, a select cartel of fertile women who provide natural-born heirs to the ruling dynasties. 

In Red City, Mal lives in luxury and pleasure, detached from the outer world. But when she's caught up in a power struggle between two city-states, her forbidden feelings for one king threaten to destroy everything she's worked for and force her to confront her true destiny.