<a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Prince+Philip&family=editorial&specificpeople=92394 ng-click='$event.stopPropagation()'>Prince Philip</a>, Duke of Edinburgh leaves Westminster Abbey after attending The Commonwealth Day Observance on March 11, 2013 in London, England. Queen Elizabeth II, who is the head of the Commonwealth, was due to attend the event, but cancelled as she continues her recovery after a brief illness. Commonwealth Day Observance takes place annually on the second Monday in March, and this year's theme is 'Opportunity Through Enterprise'.