Yuriko died on 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 Prince Mikasa at 18, the younger brother of Hirohito, months before the start of World War II.
She has recounted living in a shelter with her husband and their daughter after their residence was burned in the US fire bombings of Tokyo in the final months of the war in 1945.
Yuriko raised five children and supported Mikasa’s research into ancient Near Eastern history, while also serving her official duties and taking part in philanthropic activities, including promotion of maternal and child health. She outlived her husband and all three sons.
