The Jin-Song Wars were a series of military conflicts between the Jin Dynasty and the Song Dynasty in China during the 12th century. These wars primarily stemmed from territorial disputes and the Jin's desire to expand its influence over northern China, which was controlled by the Song. The conflicts significantly impacted the political landscape of the region. The wars began in 1125 and continued until 1234, leading to the eventual decline of the Song Dynasty. The Jin Dynasty initially achieved several victories, capturing key cities and territories. However, the Song eventually regrouped and sought alliances, which altered the course of the conflicts and contributed to the complex history of Chinese dynasties.