Wolfblade Trilogy, book 3: WarlordJennifer Fallon2005

Marla Wolfblade is reeling from the loss of her closest confidant, Elizaar the Fool, who taught her the Rules of Gaining and Wielding Power, and helped shape her into a force in Hythria. But Marla's plans for revenge are disrupted when she discovers she has a dangerous adversary.... On the border, Fardohnya has massed its troops for an invasion, and Marla's eldest son, Damin Wolfblade, heir to the throne of Hythria, finds his ability to fight back is thwarted by tradition, politics, and the foolishness of the High Prince... Back in Krakandar, Mahkas Damaran awaits news of the battle and has sealed the city against Damin's return. With the city on the brink of starvation, it seems only theft on an unprecedented scale can free Krakandar from Mahkas's madness and tyranny... and destroy Hythria's web of secrets and lies.