In this episode of the historical documentary, Professor Kate Williams explores the reign of King Charles I who succeeded his father King James I in 1625. The ties between the Wynn family and the ruling Stuarts grow ever closer as Sir Richard Wynn joins his King on an ill-fated voyage intended to gain the Infanta of Spain's hand in marriage. Having failed, Charles marries the daughter of the King Of France instead, putting a Catholic Queen back on the throne. Religious upheaval along with Charles' dismissal of Parliament and authoritarian rule eventually leads to a civil war. In the end, a king is beheaded, and a commoner named Oliver Cromwell seizes power.