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Prince Michael of Kent marries Baroness Marie-Christine von Reibnitz in Vienna, 30th June 1978. (Photo by John Downing/Getty Images)

Prince Michael of Kent marries Baroness Marie-Christine von Reibnitz in Vienna, 30th June 1978. (Photo by John Downing/Getty Images)

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Prince Michael of Kent marries Baroness Marie-Christine von Reibnitz in Vienna, 30th June 1978. (Photo by John Downing/Getty Images)

Prince Michael of Kent marries Baroness Marie-Christine von Reibnitz in Vienna, 30th June 1978. (Photo by John Downing/Getty Images)

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Prince Michael of Kent marries Baroness Marie-Christine von Reibnitz in Vienna, 30th June 1978. (Photo by John Downing/Getty Images)

Prince Michael of Kent marries Baroness Marie-Christine von Reibnitz in Vienna, 30th June 1978. (Photo by John Downing/Getty Images)

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British Royal Prince Michael of Kent and his bride, German nobility Princess Michael of Kent (Baroness Christine von Reibnitz) pose outside the British Embassy in Vienna, Austria, 30th June 1978. The couple married in a civil ceremony at the City Hall (Wiener Rathaus) in Vienna. (Photo by Hulton Archive/Getty Images)

British Royal Prince Michael of Kent and his bride, German nobility Princess Michael of Kent (Baroness Christine von Reibnitz) pose outside the British Embassy in Vienna, Austria, 30th June 1978. The couple married in a civil ceremony at the City Hall (Wiener Rathaus) in Vienna. (Photo by Hulton Archive/Getty Images)