The acting great is set to play Queen Eleanor of Aquitaine, mother of the folklore hero’s nemesis King John, played by Oscar Isaac.
It is the British actress’ first major movie role since 2007’s Atonement.
The casting announcement comes just a week after the death of Redgrave’s thespian daughter.
Natasha Richardson passed away on Wednesday after suffering a traumatic brain injury on the slopes Mont Tremblant in Montreal two days earlier.
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