Flag of Narnia. In chapter XII of the book The Horse and His Boy, the "great banner of Narnia" is described as a "red lion on a green ground", though the Pauline Baynes illustrations to that chapter and to chapter IV of The Dawn Treader show the lion as horizontal on a long triangular pennant.
based off File:Flag_of_Narnia.PNG
Groteddy created vectored by FOX 52