The Round Pond is an ornamental lake in front of a palace that has been a residence of the British Royal Family since what century?
Round Pond (London): The Round Pond is an ornamental lake in Kensington Gardens, London, in front of Kensington Palace. Kensington Palace:  It has been a residence of the British Royal Family since the 17th century, and is currently the official London residence of the Duke and Duchess of Cambridge, Prince Harry, the Duke and Duchess of Gloucester, the Duke and Duchess of Kent, and Prince and Princess Michael of Kent.
17th