From Antony and Cleopatra to Posh and Becks, this is the story of the world's biggest relationships, before, during and after they came together. Look into the private lives of big-name duos and find out just what makes power couples tick.

Many great men (and a few women) have been sustained by the support of a low profile, self-effacing partner. Power Couples investigates the rare and intriguing cases where both partners hit the headlines. Our cast spans four continents and two millennia – though the power couple only really became a commoner phenomenon in the twentieth century - and includes:

• Antony and Cleopatra
• The Macbeths
• Ferdinand and Isabella
• Elizabeth and Essex
• Victoria and Albert
• FDR and Eleanor Roosevelt
• The Kennedys
• The Clintons
• Charles and Diana

What would these men and women have achieved without their other halves? What powered the relationships that made them household names? Love? Sex? Obsessive passion? Shared ambition? A sense of duty? A hard-nosed calculation of the benefits of collaboration? You will find them all in Power Couples.