Plot summary
Preparations are underway for Mary and Darnley's wedding, but Darnley's careless behavior causes a minor crisis with Lucrezia de Medici. Bothwell helps Mary manage the crisis, and tries to convince her not to wed Darnley; Bothwell is the "Loyal Watchman" and promised Marie de Guise to protect Mary. Mary meets David Rizzio (Andrew Shaver), who relays a prophecy from Bash: Mary may have love, or an heir to a united Scotland and England, but not both. James, on Mary's orders, tries to have Keira thrown out, but Keira is fatally injured in an accident, and Darnley blames Mary. Catherine arrives in Scotland for the wedding, and comforts a distraught Mary. Elizabeth meets John Hawkins (Max Lloyd-Jones), and commissions him to explore the New World for England. Luc gains King Charles's ear and manages to convince him to re-embrace Catholicism, but King Charles's behavior is still erratic.
Credits
Adapted from Wikipedia contributors, Reign season 4. HTML formatting and reference markers removed.