Coat of Arms of Narnia: Vert, a lion rampant gules.  The colors are based on the "great banner of Narnia", described as a "red lion on a green ground" in chapter XII of the book The Horse and His Boy -- though the shields of Peter (as described in chapter X of The Lion, the Witch, and the Wardrobe) and of Rilian (as described in chapter XIII of The Silver Chair) have a red lion on silver.