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Mark Phillips riding Great Ovation during competition in the Cross Country phase of the Individual Eventing equestrian competition at the 1972 Summer Olympics in Munich, West Germany on 30th August 1972. The Great Britain eventing team, including Mark Phillips, would win the gold medal in the Team eventing competition at the 1972 Summer Olympics. (Photo by Ed Lacey/Popperfoto via Getty Images)

Mark Phillips riding Great Ovation during competition in the Cross Country phase of the Individual Eventing equestrian competition at the 1972 Summer Olympics in Munich, West Germany on 30th August 1972. The Great Britain eventing team, including Mark Phillips, would win the gold medal in the Team eventing competition at the 1972 Summer Olympics. (Photo by Ed Lacey/Popperfoto via Getty Images)