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Sep. 09, 1955 - Royal Family At Balmoral. Exercising The Ponies: Queen Elizabeth - Duke Of Edinburgh and their children Prince Charles and Princess Anne exercise their ponies in the grounds of Balmoral Castle during the August holiday this year. Prince Charles holds ''Williams''; Princess Anne holds ''Greensleeves''. Balmoral is an 11,000 acre estate bought by Prince Albert in 1852 for ~31,~00 - the castle being built three years later - and is the private property of the Sovereign. (Credit Image: © Keystone Pictures USA/ZUMAPRESS.com)