A Coronation Cup designed to commemorate the coronation of Edward VIII before his abdication of the throne is seen ahead a Sotheby's auction, at the Thomas Goode gallery in London, Britain, December 22, 2020. REUTERS/John Sibley

A Coronation Cup designed to commemorate the coronation of Edward VIII before his abdication of the throne is seen ahead a Sotheby's auction, at the Thomas Goode gallery in London, Britain, December 22, 2020. REUTERS/John Sibley

A protester holds a banner reading "Tyranny to the guillotine, abdication now!" during a demonstration against Spanish monarchy amid allegations of corruption against former Spain's King Juan Carlos, in Madrid, Spain, July 25, 2020. REUTERS/Sergio Perez

People gather in front of the Imperial Palace, on the day Emperor Akihito abdicates in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

People take pictures of the royal family, as they leave the Imperial Palace, on the day Emperor Akihito abdicates in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Police officers walk in front of the Imperial Palace, on the day Emperor Akihito abdicates in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Police officers stand guard in front of the Imperial Palace, on the day Emperor Akihito abdicates in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Crown Princess Masako leaves the Imperial Palace, on the day Emperor Akihito abdicates in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Princess Aiko arrives at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Princess Aiko arrives at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Prince Hisahito arrives at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Crown Prince Naruhito and Crown Princess Masako arrive at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Crown Princess Masako waves as she arrives at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Crown Prince Naruhito and Crown Princess Masako arrive at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Crown Prince Naruhito and Crown Princess Masako arrive at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Crown Princess Masako waves as she arrives at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Crown Prince Naruhito and Crown Princess Masako arrive at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Prince Akishino and Princess Kiko arrive at the Imperial Palace, where Emperor Akihito will abdicate in a royal ceremony, in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Princess Mako and Princess Kako arrive at the Imperial Palace in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Princess Mako arrives at the Imperial Palace in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Princess Mako arrives at the Imperial Palace in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Akihito walks for a ritual called Taiirei-Tojitsu-Kashikodokoro-Omae-no-gi, a ceremony for the Emperor to report the conduct of the abdication ceremony, at the Imperial Palace in Tokyo, Japan April 30, 2019, in this photo released by Imperial Household Agency of Japan. Imperial Household Agency of Japan/Handout via Reuters ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY.

A man takes a selfie with a newspaper featuring the abdication of Emperor Akihito in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

A man takes a selfie with a newspaper featuring the abdication of Emperor Akihito in Tokyo, Japan, April 30, 2019. REUTERS/Kim Kyung-Hoon

Korean resident in Japan, Kim Fuzan in traditional pilgrim attire walks along the Imperial Palace as he wishes a successful abdication for the emperor in Tokyo, Japan, April 29, 2019. REUTERS/Kim Kyung-hoon

Korean resident in Japan, Kim Fuzan in traditional pilgrim attire wishes a successful abdication for the emperor in front of the Imperial Palace in Tokyo, Japan, April 29, 2019. REUTERS/Kim Kyung-hoon

Police officers stand guard at a checkpoint in front of the Imperial Palace, ahead of Emperor Akihito's April 30, 2019 abdication, in Tokyo, Japan, April 29, 2019. REUTERS/Issei Kato

Imperial Guard officers stand guard at Inui-mon gate of the Imperial Palace, ahead of Emperor Akihito's April 30, 2019 abdication, in Tokyo Japan, April 29, 2019. REUTERS/Issei Kato

Japan's Emperor Akihito arrives at the tomb of his late father Hirohito to report his abdication at the Musashino Imperial Mausoleum in Tokyo, Japan April 23, 2019. Koji Sasahara/Pool via REUTERS

Japan's Emperor Akihito offers prayers to the tomb of his late father Hirohito to report his abdication at the Musashino Imperial Mausoleum in Tokyo, Japan April 23, 2019. Koji Sasahara/Pool via REUTERS

Japan's Emperor Akihito arrives at the tomb of his late father Hirohito to report his abdication at the Musashino Imperial Mausoleum in Tokyo, Japan April 23, 2019. Koji Sasahara/Pool via REUTERS

Japan's Emperor Akihito is led by a Shinto priest after visiting the tomb of his late father Hirohito to report his abdication at the Musashino Imperial Mausoleum in Tokyo, Japan April 23, 2019. Koji Sasahara/Pool via REUTERS

People see off Japan's Emperor Akihito leaving after his prayer at the Inner shrine of Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito (front, L), accompanied by Empress Michiko (front, R), waves to well-wishers before leaving Ujiyamada Station after their visit to Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito, accompanied by Empress Michiko, waves to well-wishers before leaving Ujiyamada Station after their visit to Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito, accompanied by Empress Michiko, waves to well-wishers before leaving Ujiyamada Station after their visit to Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito, accompanied by Empress Michiko, waves to well-wishers before leaving Ujiyamada Station after their visit to Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Well-wishers see off Japan's Emperor Akihito and Empress Michiko in a vehicle before leaving Ujiyamada Station in Ise in the central Japanese prefecture of Mie, on April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Well-wishers see off Japan's Emperor Akihito and Empress Michiko in a vehicle before leaving Ujiyamada Station in Ise in the central Japanese prefecture of Mie, on April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito (L), accompanied by Empress Michiko (R), waves to well-wishers before leaving Ujiyamada Station after their visit to Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, on April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito (front, L), accompanied by Empress Michiko (front, R), waves to well-wishers before leaving Ujiyamada Station after their visit to Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, on April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito (front, L) and Empress Michiko (front, R) wave to well-wishers before leaving Ujiyamada Station after their visit to Ise Jingu shrine in Ise in the central Japanese prefecture of Mie, on April 18, 2019, as Emperor Akihito takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

A vehicle transporting Japan's Emperor Akihito and Empress Michiko leave an Inner shrine of the Ise Jingu shrine, ahead of Emperor Akihito's April 30, 2019 abdication, in Ise, central Japan, April 18, 2019. REUTERS/Issei Kato

A vehicle transporting Japan's Emperor Akihito and Empress Michiko leave an Inner shrine of the Ise Jingu shrine, ahead of Emperor Akihito's April 30, 2019 abdication, in Ise, central Japan, April 18, 2019. REUTERS/Issei Kato

Japan's Emperor Akihito and Empress Michiko are seen inside their vehicle as they leave an Inner shrine of the Ise Jingu shrine, ahead of Emperor Akihito's April 30, 2019 abdication, in Ise, central Japan, April 18, 2019. REUTERS/Issei Kato

Japan's Empress Michiko leaves the main sanctuary during her visits at Inner shrine of the Ise Jingu shrine, ahead of Emperor Akihito's April 30, 2019 abdication, in Ise, central Japan, April 18, 2019. REUTERS/Issei Kato

Japan's Empress Michiko enters to the main sanctuary during her visits at Inner shrine of the Ise Jingu shrine, ahead of Emperor Akihito's April 30, 2019 abdication, in Ise, central Japan, April 18, 2019. REUTERS/Issei Kato

Priests see off Japan's Emperor Akihito leaving after his prayer at the inner shrine of Ise Jingu Shrine in Ise in the central Japanese prefecture of Mie on April 18, 2019, as he takes part in a series of rituals ahead of his abdication. Kazuhiro Nogi/Pool via REUTERS

A vehicle carrying Japan's Emperor Akihito, who takes part in a series of rituals ahead of his abdication, leaves the inner shrine of Ise Jingu Shrine in Ise, Mie prefecture, Japan April 18, 2019. Kazuhiro Nogi/Pool via REUTERS

A vehicle carrying Japan's Emperor Akihito, who takes part in a series of rituals ahead of his abdication, leaves the inner shrine of Ise Jingu Shrine in Ise, Mie prefecture, Japan April 18, 2019. Kazuhiro Nogi/Pool via REUTERS

A vehicle carrying Japan's Emperor Akihito, who takes part in a series of rituals ahead of his abdication, leaves the inner shrine of Ise Jingu Shrine in Ise, Mie prefecture, Japan April 18, 2019. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Akihito, flanked by Imperial Household Agency officials carrying two of the so-called Three Sacred Treasures of Japan, enters to the main sanctuary as he visits at Inner shrine of the Ise Jingu shrine, ahead of Emperor Akihito's April 30, 2019 abdication, in Ise, central Japan, April 18, 2019. REUTERS/Issei Kato