Yuriko died Friday at a Tokyo hospital, the Imperial Household Agency said. It did not announce the cause of death, but Japanese media said she died of pneumonia.
Born in 1923 as an aristocrat, Yuriko married at age 18 to Prince Mikasa, the younger brother of Hirohito and the uncle of current Emperor Naruhito, months before the start of World War II, the AP reported.
Her death reduces Japan’s rapidly dwindling imperial family to 16 people, including four men, as the country faces the dilemma of how to maintain the royal family while conservatives in the governing party insist on retaining male-only succession.