Emperor Naruhito expressed hopes for "an enduring relationship based on friendship" between Japan and Britain in a speech Tuesday at a state banquet hosted by King Charles III and Queen Camilla.

"It is my sincere hope that both Japan and the U.K. ... will continue to make untiring efforts for true mutual understanding through exchanges of their people, thereby building an enduring relationship based on friendship, goodwill and cooperation," the emperor said in English during the banquet at Buckingham Palace in London, which was also attended by Empress Masako.

The event was attended by about 170 people, including Prince William, Prince Edward and other royal family members, as well as people not part of the royal family. The emperor wore the Most Noble Order of the Garter, awarded to him that day, while the empress wore a tiara and an evening dress.