Prince Yasuhiko Asaka was the founder of a collateral branch of the Japanese Imperial Family and served as a general in the Imperial Japanese Army during the Japanese invasion of China and the Second World War. He was the son-in-law of Emperor Meiji and uncle by marriage of Emperor Hirohito. He is most notable for being the commander of Japanese forces outside Nanjing in December 1937, when he presided over the mass murder and rape of hundreds of thousands of Chinese soldiers and civilians during the Nanjing Massacre.