the royal couple, along with royals from all over the world this week flown in to participate in a three days long celebration at the japanese kejserfamilie.

And it was a very special reason.

It was in fact a relatively rare event, there was the royal to find the beautiful robes and diamantbesatte tiaras forward.

The three-day festivities happened in conjunction with a tronskifteceremoni, where you celebrated the new japanese kejserpar, emperor Naruhito and empress Masakos.

And it is very special and very large, explains kongehusekspert and historian Lars Hovbakke Sørensen:

"Normally, the japanese emperors seated to the door. It is unusual that he (the emperor Akihito, red.) has chosen to abdicate this time. So it is a whole new tradition. It is not often that it happens," he says and adds that it is rare that one can attend a tronskifte in Japan. The last was 30 years ago.

Denmark was represented by the crown prince and crown princess.

in Particular, crown princess Mary, made a good figure and got the international media to fall into a swoon over his gorgeous dresses.

the crown prince and crown princess were also the right ones to send.

The japanese emperor has a high status in the royal context, and therefore it would be unthinkable to send other than the Queen or the crown prince Frederik and crown princess Mary of denmark.

"When there is a big important event like getting a new emperor, so you can send the foremost representatives," explains Lars Hovbakke Sørensen.

According to historian and kongehusekspert Michael Bregensbro from the University of Southern denmark, it is quite natural that opbuddet of the royal was so big:

"There are not many monarchies left in the world, so that is why the remaining monarchies hold together and take part in each Trendbet other's events," he says.

in Addition to the Danish crown prince couple was also attended by, among others, prince Charles, the Spanish king and queen, the Swedish king and crown princess, the Norwegian crown prince couple of denmark and the Dutch monarchy.

When the team of royal A-guests is so large, it is connected with two things:

Japan's special status as the empire and Japan's ties to the West.

"In Japan has an emperor a high status. It is a title, for historical purposes, has a higher status than, for example, a king of Thailand," explains Lars Hovabkke Sørensen.

He explains that the japanese kejsertitel is a little different than those we know from Europe.

"Forward to the Second world War, the emperor had great power and divine status – he's been deprived of, and is now as a western european monarch: Without any political influence."

The second reason for the large turnout is that Japan has a particular attachment to Europe, explains Michael Bregnsbro:

"Japan is in addition an important trading partner, a key western ally in Asia, and a strong attendance from the european fyrstehuse can be to emphasize this partnership in an informal way," he says.

He believes that the tronskiftet, therefore, is an important event for the West:

"Although Japan is a constitutional monarchy, then the emperor is nevertheless a significant influence, both formally and informally. Therefore, it has significance, how the new emperor will play its role," he says.

the crown prince couple were in Japan from Monday to Thursday, where tronskifteceremonien took place.