The biblical drama follows a battle-weary and violent king, a capable but bitter prophet and a resourceful shepherd.
Ray Winstone was last week confirmed to star as Saul, First King of Israel.
Richardson-Sellers, who stars in 'The Originals' as Rebekah's new body, will appear as the king's youngest child Michal, reported Deadline.
The actress was previously cast in 'Star Wars: Episode VII - The Force Awakens' and is rumoured to play a descendant of Jedi Obi-Wan Kenobi.
Shooting in South Africa, 'Of Kings and Prophets' is penned by Adam Cooper and Bill Collage. Jeffrey Nachmanoff will direct.