Emperor Naruhito is greeted by dignitaries has he and Empress Masako arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito, left, and Empress Masako walk down from their aircraft as they arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Empress Masako gestures as she speaks to dignitaries as she and Emperor Naruhito arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Japan Empress Masako smiles as she disembarks at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (Chris Radurn/PA via AP)
Emperor Naruhito is saluted by a member of the honour guard as he and Empress Masako arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito and Empress Masako smile at the media walk through a guard of honour after arriving at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito and Empress Masako walk through a guard of honour after arriving at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
FILE - Japan's Emperor Naruhito is shown around The Quire in St George's Chapel, Windsor Castle by Charlotte Manley, St George's Chapel Chapter Clerk, as he continues his state visit to the UK, in Windsor, England, Thursday June 27, 2024. Naruhito and the Empress Masako, who studied at Oxford a few years after her husband, wrapped up a weeklong trip to Britain on Friday. Their itinerary combined the glitter and ceremony of a state visit with four days of less formal events that gave the royal couple an opportunity to revisit their personal connections to Britain. (Andrew Matthews/Pool Photo via AP, File)
Emperor Naruhito and Empress Masako are greeted by dignitaries as they arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito is saluted by a member of the honour guard as he and Empress Masako arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito and Empress Masako disembark their aircraft as they arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito and Empress Masako are greeted by dignitaries as they arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
FILE - Japan's Emperor Naruhito of Japan is shown around The Quire in St George's Chapel, Windsor Castle by Charlotte Manley, St George's Chapel Chapter Clerk, as he continues his state visit to the UK, in Windsor, England, Thursday June 27, 2024. Naruhito and the Empress Masako, who studied at Oxford a few years after her husband, wrapped up a weeklong trip to Britain on Friday. Their itinerary combined the glitter and ceremony of a state visit with four days of less formal events that gave the royal couple an opportunity to revisit their personal connections to Britain. (Andrew Matthews/Pool Photo via AP, File)
The Japanese flag flies form the cockpit window of the plane carring Emperor Naruhito and Empress Masako as it arrives at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
FILE - Head of Baliol College Helen Ghosh, right, and Chancellor of the University of Oxford Chris Patten, left, walk with, Emperor Naruhito of Japan and his wife Empress Masako, as they arrive for a visit to Balliol College in Oxford, England, during their state visit to Britain, Friday, June 28, 2024. Naruhito and the Empress Masako, who studied at Oxford a few years after her husband, wrapped up a weeklong trip to Britain on Friday. Their itinerary combined the glitter and ceremony of a state visit with four days of less formal events that gave the royal couple an opportunity to revisit their personal connections to Britain. ( Joe Giddens/Pool Photo via AP, File)
FILE - Britain's King Charles III, left and Japans Emperor Naruhito ride in a one carriage during the ceremonial welcome for the State Visit to Britain of the Emperor and Empress, in London, Tuesday, June 25, 2024. Naruhito and the Empress Masako, who studied at Oxford a few years after her husband, wrapped up a weeklong trip to Britain on Friday. Their itinerary combined the glitter and ceremony of a state visit with four days of less formal events that gave the royal couple an opportunity to revisit their personal connections to Britain. (AP Photo/Kin Cheung, Pool, File)
The plane carrying Emperor Naruhito and Empress Masako arrives at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
Emperor Naruhito is greeted by dignities as he and Empress Masako arrive at Stansted Airport, England, Saturday, June 22, 2024, ahead of a state visit. The state visit begins Tuesday, when King Charles III and Queen Camilla will formally welcome the Emperor and Empress before taking a ceremonial carriage ride to Buckingham Palace. (AP Photo/Kin Cheung)
FILE - Japan's Prince Hiro, right, talks with a fellow student at Oxford University when he and other students were welcomed to the university at a matriculation ceremony, on Oct. 15, 1983. Naruhito and the Empress Masako, who studied at Oxford a few years after her husband, wrapped up a weeklong trip to Britain on Friday. Their itinerary combined the glitter and ceremony of a state visit with four days of less formal events that gave the royal couple an opportunity to revisit their personal connections to Britain. (AP Photo/Peter Kemp, File)
FILE - Britain's King Charles III, Emperor Naruhito, left, Empress Masako and Queen Camilla, right, make their way along the East Gallery to attend the State Banquet in London, Tuesday, June 25, 2024, during the State Visit of the Japanese Emperor and Empress to Britain. Naruhito and the Empress Masako, who studied at Oxford a few years after her husband, wrapped up a weeklong trip to Britain on Friday. Their itinerary combined the glitter and ceremony of a state visit with four days of less formal events that gave the royal couple an opportunity to revisit their personal connections to Britain. (Aaron Chown/Pool via AP, File)
FILE - Japan's Emperor Naruhito inspects the honour guard on Horse Guards parade during the ceremonial welcome for start of the State Visit to Britain by the Japanese Emperor and Empress, in London, Tuesday, June 25, 2024. Naruhito and the Empress Masako, who studied at Oxford a few years after her husband, wrapped up a weeklong trip to Britain on Friday. Their itinerary combined the glitter and ceremony of a state visit with four days of less formal events that gave the royal couple an opportunity to revisit their personal connections to Britain. (AP Photo/Kin Cheung, Pool, File)