The Tianjing incident takes place in Nanjing, China.

The Tianjing Incident was a major internal political conflict within the Taiping Heavenly Kingdom occurring during the late Qing dynasty from September 2 to October 1856. The conflict itself took place in the Taiping's capital city Tianjing. A few key leaders of the Taiping Rebellion were killed: the East King Yang Xiuqing, the North King Wei Changhui and the Yan King Qin Rigang. More than 27,000 other opposition rivals including soldiers perished in the conflict as well. The Tianjing Incident was said to be one of the factors which led to the eventual failure of the Taiping Rebellion, as well as the turning point in its fate.

Nanjing is the capital of Jiangsu, a province in East China. The city, which is located in the southwestern corner of the province, has 11 districts, an administrative area of 6,600 km² (2,500 sq mi), and as of 2021 a population of 9,423,400. Situated in the Yangtze River Delta, Nanjing has a prominent place in Chinese history and culture, having served as the capital of various Chinese dynasties, kingdoms and republican governments dating from the 3rd century to 1949, and has thus long been a major center of culture, education, research, politics, economy, transport networks and tourism, being the home to one of the world's largest inland ports. The city is also one of the fifteen sub-provincial cities in the People's Republic of China's administrative structure, enjoying jurisdictional and economic autonomy only slightly less than that of a province. It has also been awarded the title of 2008 Habitat Scroll of Honor of China, Special UN Habitat Scroll of Honor Award and National Civilized City. Nanjing is also considered a Beta city classification, together with Chongqing, Hangzhou and Tianjin by the Globalization and World Cities Research Network, and ranked as one of the world's top 100 cities in the Global Financial Centres Index.