When Megan Markle weds Prince Harry she will be joining the most famous family in the world.

She will also be following in the footsteps of other women who’ve married into the House of Windsor and, in doing so, have helped transform the royal dynasty.

Princess Diana and Camilla, Duchess of Cornwall are among the wives who’ve had an indisputably powerful impact on ‘The Firm’.

But other women, including Catherine, the Duchess of Cambridge and Sophie, Countess of Wessex, have also played their parts in adapting the ancient institution to the 21st century.

Royal biographers Andrew Morton and historian David Starkey are among the contributors. Continues tomorrow.