Isabel of Gloucester

Origin
Isabel was the first wife of Prince John who was established as the main antagonist in the Robin Hood stories by Howard Pyle in his 1883 book The Merry Adventures of Robin Hood where John's characterization is heavily influenced by his portrayal in Sir Walter Scott's Ivanhoe.

In Robin Hood
She has appeared as Prince John's ex-wife or as a witch who aids him against Robin Hood his the Merry Men.

Film:

 * 2010 Robin Hood played by Jessica Raine

Literature:

 * The Devil and King John (as Hadwisa) by Philip Lindsay
 * Isabella of Angouleme: the Tangled Queen Part One (as Avisa) by Erica Laine

Television:

 * The Adventures of Robin Hood (1956) Helen Cherry
 * Robin of Sherwood (1984 - 1986) (as Hadwisa) Patricia Hodge