While there are many fabulous fiction and non-fiction children's books about Classical antiquity, most focus on mythology or history. Those subjects are excellent in their own right, as knowledge of history and myth help us put things in historical context and allow us to dream.
However, with this list, I am especially focused on children's book that teach Classical virtues like courage, justice, moderation, and wisdom, and which illustrate how we can aspire to become a person of character. These 3 books help kids learn about important Greek and Roman virtues: