Run Sandringham started by Prince William, Prince George and Princess Charlotte
Run Sandringham had some very special starters to send runners on their way on Father's Day on Sunday ... Prince William, Prince George and Princess Charlotte.
William brought the children over from Anmer Hall and they all counted down from 10 to zero to start the half-marathon.
Runners could choose between a half marathon, 5k or community mile, with many raising funds for charity such as the East Anglian Air Ambulance, for whom William was once a pilot, Break and Lynn-based Scotty's Little Soldiers.
Prince William and seven-year-old George and six year-old Charlotte were all casually dressed for the occasion and their presence delighted the runners.
Prince George wore a smart pair of £30 blue chino shorts from Boden and £48 check shirt from Italian designer Il Gufo.
Princess Charlotte matched her brother in £40 Nike trainers and £12 blue Mini Boden shorts, completing her look with a £36 baby pink Ralph Lauren jumper.
Race director Aaron Murrell said it had been a great inaugural Run Sandringham.
He said: "We're really pleased, it was really good. We had 1,300 people finish. We had some light rain during the event but it stayed nice.
"We were really pleased Prince William and the children came over and it was so good of them to give up their time. I think they really enjoyed the race."
The routes of the various races wended their way around the royal estate. There will be another Run Sandringham on Sunday, September 26 and organised by Good Running Events.