Plot summary
Queen Mary discovers that Greer is pregnant, and uses her new Vatican-funded army to free Aloysius Castleroy, Greer's husband, from prison. Greer and Aloysius reconcile, and leave to start a new life elsewhere. Bash confesses to Queen Mary that his feelings for her never fully went away, and promises to go to Scotland with her. Charles and Narcisse secretly go to a high-stakes casino to win money to pay the royal soldiers. However, the Red Knights poison all the royal generals just before they are paid, so to frame Catherine and Charles for the massacre.
Queen Elizabeth conspires with Lola to punish Beatrice Somerset, a lady who testified against Elizabeth's mother, Anne Boleyn, which led to Anne's execution. Queen Elizabeth learns that the accusation of incest against Anne was true, but Anne only resorted to it because she feared her husband King Henry VIII would kill her if she did not give him a son. Elizabeth pardons Beatrice and rewards Lola's loyalty by bringing Jean-Philippe to her.
Credits
Adapted from Wikipedia contributors, Reign season 3. HTML formatting and reference markers removed.