About Yasuhito, Prince Chichibu
Yasuhito, Prince Chichibu (秩父宮雍仁親王, Chichibu-no-miya Yasuhito Shinnō; 25 June 1902 – 4 January 1953) was the second son of Emperor Taishō (Yoshihito) and Empress Teimei (Sadako), a younger brother of Emperor Shōwa (Hirohito) and a general in the Imperial Japanese Army. As a member of the Imperial House of Japan, he was the patron of several sporting, medical, and international exchange organizations. Before and after World War II, the English-speaking prince and his wife attempted to foster good relations between Japan and the United Kingdom and enjoyed a good rapport with the British royal family. As with other Japanese imperial princes of his generation, he was an active-duty career officer in the Imperial Japanese Army. Like all members of the imperial family, he was given immunity from criminal prosecution before the International Military Tribunal for the Far East by Douglas MacArthur. == Background and family == Born at Aoyama Detached Palace in Tokyo, the second son of Crown Prince Yoshihito (later Emperor Taishō) and Crown Princess Sadako (later Empress Teimei), the prince was originally titled Atsu no miya (Prince Atsu). He and his elder brother were separated from their parents and entrusted to the care of a respected ex-naval officer, Count Kawamura Sumiyoshi and his wife. After Kawamura died in 1904, the young princes rejoined their parents at the Tōgū-gosho (Crown Prince's residence) on the grounds of the Akasaka estate. He attended the elementary and secondary departments of the Gakushuin Peers' School along with Crown Prince Hirohito, and his younger brother, Prince Nobuhito (born in 1905) (a fourth brother, Prince Takahito, was born in 1915). Prince Chichibu enrolled in the Central Military Preparatory School in 1917 and then in the Imperial Japanese Army Academy in 1922.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.