靖康之变
The Song dynasty re-established unity around 960. Under the Song, the prosperity of South China began to overtake that of North China. After the north was lost to the Jurchen Jin dynasty in 1127 following the Jingkang Incident, Hangzhou became the capital of the Song dynasty under the name Lin'an, which was renowned for its prosperity and beauty, it was suspected to have been the largest city in the world at the time.