The stands are starting to fill up at Greenwich Park awaiting the Olympic equestrian debut of Zara Phillips, the granddaughter of Queen Elizabeth II.

Phillips is third up Sunday morning in the dressage portion of the eventing competition, which also includes cross country and show jumping.

The VIP section so far is empty, but royals are expected to come cheer on the 31-year-old Phillips, who will be riding High Kingdom.

Aside from her grandmother, Phillips may count on cousins Princes William and Harry and William's wife Kate. Phillips' mother, Princess Anne, is not only president of the British Olympic committee but a member of the International Olympic Committee and a former equestrian eventing Olympian herself. Her father, Capt. Mark Phillips, is a coach on the American equestrian team and may catch a glimpse of his daughter as well.

Greenwich Park, where all equestrian events are taking place, dates from 1433 and is London's oldest royal park — as well as home to the Meridian Line. The main equestrian arena sits right in front of Queen's House, a 17th-century building built as a summer palace for Queen Anne of Denmark, the wife of James I.

—Nicole Winfield — Twitter

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