Listen to the rest of the story of Catherine II, the greatest tsarina of the 18th century, told by Virginie Girod. Catherine was married to the future Tsar of Russia, Peter III.
The royal couple does not have a good relationship. Pierre even insulted his wife as an idiot! This lack of respect is a signal. The sovereign could repudiate her to marry his mistress. Catherine prefers to act and set up a conspiracy: she builds friendships with the aristocrats dissatisfied with the tsar's policies as well as in the army.