Alanna, la guerrera / Alanna, The First Adventure

Young Alanna knows she is not meant to become some proper lady cloistered in a convent and wants to be a great warrior maiden instead, but in the land of Tortall, women aren't allowed to train as warriors, so Alanna finds a way to switch places with her twin, Thom, and take his place as a knight in training at the palace of the King.