Plot summary
Don Carlos survives his injury but is brain-damaged. Fadrique, Duke of Alba ( Richard De Klerk ) investigates the accident, but Mary and Catherine escape being implicated. Narcisse holds an inquest into Catherine's possible poisoning of Francis, but with Bash's help, Catherine exhumes Francis's intact corpse, proving that the blackened liver was from someone else. Unknown to all, Cardinal Morel was behind the attempt to frame Queen Catherine at the urging of a secret party; upon his failure, he is killed. Lord Cunningham ( Giles Panton ), a Scottish Lord, brings Mary news of famine in Scotland, and that Elizabeth has taken Lola's family hostage and wants Lola to travel to her court in exchange for their freedom.
At Catherine's advice, Mary gets engaged to the child-like Don Carlos, who is smitten with Mary and sends grain to Scotland at her urging. Lady Lola discovers the truth of how Narcisse manipulated her into marrying him; she leaves him and goes to Queen Elizabeth's court to save her family.
Credits
Adapted from Wikipedia contributors, Reign season 3. HTML formatting and reference markers removed.