Prince George's christening: The then Duke and Duchess of Cambridge with their three-month-old son JOHN STILLWELL/Getty Images On 23 October 2013, Prince William and Kate Middleton christened their eldest son, Prince George, at The Chapel Royal in St James's Palace. Prince George's christening was a moment of national excitement, not only because it offered a glimpse of William and Kate, but because Prince George, born George Alexander Louis on 22 July 2013, was the heir to the throne.