Premise: 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.
Hypothesis: Yi Bangja's birthday is November 4th.