One chapter in this work tells of how a man named Gobryas made an alliance 
One chapter in this work tells of how a man named Gobryas made an alliance with this work's main character after the former's king was slain by that character in battle. At one point in this work, it is argued to Chrysantas that "the best should have the preference both in honors and gifts," but this work ends on a sour note, chiding a certain group for allowing rigor to die out while preserving effeminacy, as well as losing the art of chariot warfare. The subject of this work shows his mercy by releasing the wife of Tigranes, the king of Armenia and arranges an expedition to India, while in another section, that subject's men are instructed that "courage is more likely to save men's lives than running away," following a battle against the Assyrians. This work's second chapter begins with a recounting of the lineage of its subject, the son of Mandane and Cambyses, and this work goes on to tell how its main subject overthrew his grandfather Astyages to assume his most famous position. For 10 points, identify this quasi-fictional biography of the founder of the Persian Empire, a treatise on leadership written by Xenophon.
One chapter in this work tells of how a man named Gobryas made an alliance with this work's main character after the former's king was slain by that character in battle.
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