Royalty does not like plurals. However, the hard work of power often allows the other spouse to come forward. Jean-François Solnon managed to find a woman standing at the throne behind a man and vice versa. He introduces us to the history of the most famous ruling spouses: from Justinian and Theodora in Byzantium to Nicholas II and Alexandra in Russia. And between them, history also included Isabella of Castile and Ferdinand of Aragon, Louis XIII and Anne of Austria, Victoria and Albert, Napoleon III and Eugenie, Franz Joseph and Sissy... An excellent presentation style and an innovative approach give rise to a book that is both educational and easy to read. The book is addressed to everyone who is interested in history.