On 1 May, Crown Prince Naruhito will rise the Chrysanthemum Throne after his dad abandons, turning into the new head of Japan.
Both the renouncement and promotion will include profoundly emblematic Shinto services, and integral to them will be three items - a mirror, a sword and a diamond - known as the Imperial Treasures or Regalia.
The inceptions and whereabouts of the baffling items are covered in mystery, yet legends about them are peppered all through Japanese history and popular culture.
For what reason are the Imperial Treasures so significant?
Japan's informal national religion, Shinto, places enormous significance on custom to keep up an association with the past and with spirits which intercede in human lives.
The Imperial Treasures are a piece of this. They are said to have been passed down from the divine beings through ages of sovereigns seen as their immediate descendents. Without a supreme crown, the fortunes go about as the image of majestic influence.
Be that as it may, the fortunes are so sacrosanct, they are kept escaped the world.
"We don't have the foggiest idea when they were made. We have never observed them," Prof Hideya Kawanishi from Nagoya University told the BBC.
"Indeed, even the Emperor has never observed them."
Actually they won't be at the royal celebration - imitations (which still won't be seen) will be utilized, and the firsts - in the event that they are even that - will remain at their holy places around the nation.
Yata no Kagami - the holy mirror
The mirror, which might be over 1,000 years of age, is accepted to be kept at the Ise Grand Shrine in Mie prefecture. As indicated by Shinsuke Takenaka at the Institute of Moralogy - a Japanese body which explores morals and profound quality - it is viewed as the most valuable of the fortunes.
It was the just a solitary one of the fortunes which did not highlight in the last enthronement in 1989.
In Japanese fables, mirrors are said to have divine power and to uncover truth. In the supreme functions, Yata no Kagami - or eight-sided reflect - speaks to the shrewdness of the sovereign.
As per the Kojiki, the antiquated composed record of Japanese legends, the Yata no Kagami was made by the god Ishikoridome.
After the sun goddess Amaterasu battled with her sibling Susanoo, the lord of the ocean and tempests, she withdrew to a cavern taking the light of the world with her.
Susanoo orchestrated involved with draw her out, and Amaterasu was amazed by her very own appearance in the mirror. They fixed their quarrel, taking light back to the universe.
The mirror and different fortunes in the end advanced toward Amaterasu's grandson, Ninigi.
As per the legends, says Mr Takenaka, the goddess told Ninigi: "Serve this mirror as my spirit, similarly as you'd serve me, with clean personality and body."
Ninigi is accepted to be the incredible granddad of Jimmu, who legends state turned into Japan's first sovereign in 660 BC.
Kusanagi no Tsurugi - the sacrosanct sword
The area of the Kusanagi no Tsurugi - or grass-cutting sword - isn't clear, yet it might be at the Atsuta Shrine in Nagoya.
Picture copyrightBBC/DAVIESSURYA
Legend says it developed in the tail of an eight-headed snake that was eating up the little girls of a well off family.
The dad spoke to Susanoo for help, promising marriage to his last uneaten little girl on the off chance that he could free them of the snake. Susanoo deceived the snake into getting alcoholic, at that point remove its tails, finding the sword.
Be that as it may, he didn't have it for long - it also was utilized in his endeavors to make up with his sister, Amaterasu.
The sword speaks to the grit of the sovereign. Since so little is thought about it and where it is kept, some inquiry whether the sword in reality still exists.
It's surely been kept covertly - one cleric who revealed having seen it in the Edo time frame (some time between the seventeenth and nineteenth Century) was exiled.
There are bits of gossip it might have been lost adrift amid a twelfth Century fight, however Mr Takenaka says that may itself have been a duplicate, and that a copy of that, kept at the royal residence, is utilized for crowning ordinances.
At the point when Emperor Akihito went to the position of royalty in 1989 he was given a sword said to be Kusanagi no Tsurugi. Be that as it may, the case he was given stayed unopened.
Yasakani no Magatama - the hallowed gem
A magatama is a sort of bended dab which began being made in Japan around 1,000 years BC. Initially enhancing, they began taking on representative esteem.
Picture copyrightBBC/DAVIESSURYA
As per the legend, the Yasakani no Magatama was a piece of jewelry made by Ame-no-Uzume, goddess of happiness, who assumed a focal job in the endeavors to draw Amaterasu from her cavern.
She played out an excessive move, wearing the dots, to cause a confusion and pull in the sun goddess' consideration.
Whatever its sources, the Yasakani no Magatama, made of green jade, might be the main enduring "unique" among the three fortunes.
It is housed in the majestic castle in Tokyo and in the enthronement service, speaks to the altruism expected of a sovereign.
Do Japanese have confidence in the fortune?
While Japan's sovereigns follow their genealogy to Amaterasu, they never again guarantee to be divine beings themselves - Emperor Hirohito repudiated his perfect status after Japan's thrashing in World War Two.
Picture copyrightCULTURE CLUB/GETTY IMAGES
Picture subtitle
A delineation of the crowning ceremony of Emperor Taisho in 1912 in Kyoto
Prof Kawanishi says there are numerous in Japan who still think about the articles as being permeated with awesome power, however that numerous individuals "consider them now more as trimmings, somewhat like a crown in different governments".
They're to a great extent significant in light of the fact that they "demonstrate the puzzle of the sovereign", he says, and as an "image that the framework has proceeded for quite a while".
Mr Takenaka says there is additionally a view among researchers that the things speak to the combination of Japan's old indigenous gatherings with fresh debuts.
In view of that hypothesis, he says, the three fortunes are an image the ruler ought to join the ethnic gatherings without segregation.
Yet, he includes that in the twentieth Century, the expression "three fortunes" additionally took on a marginally increasingly handy importance, turning into the expression for the three things Japanese individuals felt they couldn't live without: a TV, an icebox and a clothes washer.