In The Horse and his Boy, (the events of which all occur during the reign of the four Pevensie children in Narnia, an era which begins and ends in the last chapter of The Lion, the Witch and the Wardrobe), Hwin and Aravis fall into company with the talking stallion, Bree, to whom Hwin is distantly related, and the boy Shasta.
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Hwin also plays a vital role in their escape through Tashbaan, but her plan of disguising themselves fails when King Edmund of Narnia mistakes Shasta for Prince Corin of Archenland and Aravis is recognised by a friend.