It was the last major royal wedding of the 20th century and it began a new chapter in a royal story that would lead to a throne. On December 4th 1999, the then heir to the Belgian throne, Philippe, married Mathilde d’Udekem d’Acoz before a host of regal guests. The couple became King and Queen of the Belgians in 2013. On the twentieth anniversary of their marriage, Royal Central…