KongehusetTwo of the most popular royals in Europe will be meeting up this autumn for a series of appearances. Queen Mary of Denmark will be heading to Belgium in September for a State Visit and her host will be Queen Mathilde. King Frederik X of Denmark and Queen Mary are to make a three day State Visit to Belgium, starting on September 8. Day one will also see Frederik and Mary meet the Belgian Prime Minister, the Federal Parliament and the Mayor of Brussels. Both Queen Mary and Queen Mathilde are regularly voted the most popular member of their respective royal families.