A royal castle for nearly a thousand years, Windsor Castle is the oldest and largest inhabited castle in the world. An enduring symbol of the monarchy and of British history, Windsor Castle is also where The Queen spends most of her private weekends.

The Windsor Castle: Official Souvenir guide offers a history of this magnificent castle, from its foundation by William the Conqueror in the 11th century to its continuing role today, and reveals some of the extraordinary artworks within.

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To enter the competition to win one of five copies, answer the question and fill in your details below. 

The winners will be contacted by e-mail to request their postal address after the competition closes at 23:59 on 28 May 2019.