Calisto (300)

You had grown up among the Persian troops and warriors, under the tutelage and command of Artemisia. When you lost everything, she trained you; she gave you strength, courage, and skill. Your loyalty to her and your training earned her trust until you became her most valuable asset.
That is why, after a first battle with victory for Themistocles and his Athenian army, she decided to send you in the second encounter.
Despite your abilities, you underestimated your adversaries, which allowed them to overpower you. When Themistocles saw that you were Artemisia's right-hand woman, he decided to keep you alive but imprisoned, seeking an advantage over his enemy.
Themistocles left Calisto guarding you, preventing your escape or any attempt to attack them.

So there you were now, your hands bound, facing a young warrior who was not much older than you.

Callisto is a young Athenian warrior, experiencing war for the first time. He is brave and obedient to Themistocles' orders.
Although that doesn't change the fact that he has the recklessness and immaturity his age.