John Rabe (1882-1950) was a German businessman. Originally from Hamburg, he moved to China in 1908 and spent most of the following decades there as a representative of the Siemens company. When the Japanese military began its attacks on the city, Rabe decided to remain in Nanjing. In 1937, together with other foreigners, he formed the International Committee for the Nanjing Safety Zone and served as its chairman. In this position as ‘de facto mayor’ of Nanjing, he helped save thousands of Chinese from death of starvation, cold, or atrocities committed by the Japanese military (Nanjing Massacre). During the critical period from September 1937 to February 1938, Rabe wrote a detailed diary comprising more than 1800 pages. This diary is the main object of this research project.