Queen Elizabeth II visited the Royal Windsor Horse, held at Windsor. The queen likes to attend the yearly event, held in celebration of all things equestrian, and this year was no exception despite the muddy conditions due to rain. Here are some photographs of the queen taken during days three and four, May 10 and 11, 2012. The Duke of Edinburgh was also in attendance. Prince Philip, who will be 91 years old next month, appears to be in very good health, and was photographed on day four carrying a heavy car battery which was used for timing the carriage driving events. The duke was a keen carriage driver who often participated in the event in the past. as Photos by Getty Images.