Female Uesugi Kenshin theory
Female Uesugi Kenshin Theory (上杉謙信女性説) is a hypothesis proposed by novelist Tomeo Yagiri in 1968, suggesting that Uesugi Kenshin, the daimyo of Echigo Province during the Sengoku period, might have actually been a woman. == Theory == In the mid 20th century Japanese novelist Tomeo Yagiri theorized that Uesugi Kenshin was a woman after he discovered a report on 16th century Japan in the monastery of Toledo which was used as a fort during the Spanish Civil War.
Source: Wikipedia — Female Uesugi Kenshin theory (CC BY-SA 4.0)