About Yuriko, Princess Mikasa
Yuriko, Princess Mikasa was a member of the Imperial House of Japan as the wife of Takahito, Prince Mikasa, the fourth son of Emperor Taishō and Empress Teimei. The Princess was the last surviving paternal great-aunt by marriage of Emperor Naruhito and, before her death, was the oldest member of the imperial family, and the final living member who was born in the Taishō era. Yoshihito, Prince Katsura (桂宮宜仁親王, Katsura-no-miya Yoshihito Shinnō; 11 February 1948 – 8 June 2014); created Katsura-no-miya on 1 January 1988.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.