PATTENSEN, GERMANY - APRIL 30: Prime Minister of the State of Lower Saxony Stephan Weil and Prince Ernst August of Hanover attend the official opening of the 'Der Weg zur Krone - Das Koenigreich Hannover und seine Herrscher' ('The Road to the Crown - The Kingdom of Hanover and Its Rulers) exhibition at Schloss Marienburg at Schloss Marienburg on April 30, 2014 in Pattensen, Germany. The city of Hanover is scheduled to hold a celebration for the British Royal Family to mark the '300-year personal union' in May and June this year. Prince Andrew, Duke of York, is expected to take part in the celebrations in June. (Photo by Alexander Koerner/Getty Images)

PATTENSEN, GERMANY - APRIL 30:  Prime Minister of the State of Lower Saxony Stephan Weil and Prince Ernst August of Hanover attend the official opening of the 'Der Weg zur Krone - Das Koenigreich Hannover und seine Herrscher' ('The Road to the Crown - The Kingdom of Hanover and Its Rulers) exhibition at Schloss Marienburg at Schloss Marienburg on April 30, 2014 in Pattensen, Germany. The city of Hanover is scheduled to hold a celebration for the British Royal Family to mark the '300-year personal union' in May and June this year. Prince Andrew, Duke of York, is expected to take part in the celebrations in June.  (Photo by Alexander Koerner/Getty Images)