Question: What year was the mother of Masako, Crown Princess of Japan born?

Context articles: Yi Bangja
Crown Princess (ship)
Masako, Crown Princess of Japan
Tōgū Palace
Yamaya Tanin
Crown prince
Aiko, Princess Toshi
Princess Masako Takeda
Masako Sen
Empress Michiko

Yi Bangja, Crown Princess Uimin of Korea (also "Euimin", Japanese: 李方子 "Ri Masako") (4 November 1901 – 30 April 1989) was the consort of Crown Prince Euimin of Korea.
 She and her husband would have been the emperor and empress of the Empire of Korea if Korea had not been annexed to the Empire of Japan in 1910.
Crown Princess is a "Grand"-class cruise ship owned and operated by Princess Cruises.
 Her maiden voyage took place on June 14, 2006, departing Red Hook, Brooklyn (New York) for Grand Turk (Turks & Caicos), Ocho Rios (Jamaica), Grand Cayman (Cayman Islands), and Port Canaveral (Florida).
 As of 2015, the "Crown Princess" sails to Mexico for the Winter season, and Alaska for the Summer season.
 Like her sister ships "Emerald Princess" and "Ruby Princess" her Skywalkers Night Club is built aft of the funnel rather than suspended over the stern.
 Her godmother is Martha Stewart.
Masako, Crown Princess of Japan (皇太子徳仁親王妃雅子 , Kōtaishi Naruhito Shinnōhi Masako ) , born Masako Owada (小和田雅子 , "Owada Masako" ) on 9 December 1963, is the wife of Naruhito, Crown Prince of Japan, who is the eldest son of Emperor Akihito and Empress Michiko and the heir apparent to the Chrysanthemum Throne.
 She is a member of the Imperial House of Japan through marriage.
 Should the Crown Prince ascend the throne as expected upon his father's abdication, Masako will become empress consort.
The Tōgū Palace (東宮御所 , Tōgū-gosho ) is located in the Akasaka Estate in Akasaka, Tokyo, and is the official residence of Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Toshi.
Tanin Yamaya (山屋 他人 , April 18, 1866 – September 10, 1940) was a naval theorist and admiral in the Imperial Japanese Navy during the early twentieth century.
 He was a great-grandfather of Japanese Crown Princess Masako.
A crown prince or crown princess is the heir apparent to the throne in a royal or imperial monarchy.
 The wife of a crown prince is also styled crown princess.
Aiko, Princess Toshi (敬宮愛子内親王 , Toshi-no-miya Aiko Naishinnō , born 1 December 2001) is the only child of Crown Prince Naruhito and Crown Princess Masako of Japan.
Princess Masako Takeda (恒久王妃昌子内親王 , Tsunehisa Ōhi Masako naishinnō ) , born Masako, Princess Tsune (常宮昌子内親王 , Tsune-no-miya Masako Naishinnō , 30 September 1888 – 8 March 1940) , was the tenth child and sixth daughter of Emperor Meiji of Japan and one of his consorts, Sono Sachiko.
Masako Sen (千容子 , Sen Masako , born 23 October 1951) , formerly Princess Masako of Mikasa (容子内親王 , Masako Naishinnō ) , is the fourth child and second daughter of Takahito, Prince Mikasa and Yuriko, Princess Mikasa.
 She married Soshitsu Sen on 14 October 1983.
 As a result, she gave up her imperial title and left the Japanese Imperial Family, as required by law.
Michiko (美智子 ) , born Michiko Shōda (正田美智子 , Shōda Michiko ) on 20 October 1934, is the Empress of Japan as the wife of Akihito, the current Emperor of Japan reigning from 7 January 1989.
 She succeeded her mother-in-law, Empress Nagako (Kōjun), consort of Emperor Hirohito (Shōwa).