Camilla, Duchess of Cornwall and Catherine, Duchess of Cambridge leave by carriage after attending the annual Order of the Garter Service at St George's Chapel on June 18, 2011 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. Membership in the order is limited to the sovereign, the Prince of Wales, and no more than twenty-four members.
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