as their equals. After the Jurchen-led Jin dynasty toppled the Liao dynasty in a rebellion aided by the Song dynasty, they turned against Song and conquered northern China as far south as the Huai River in the Jin–Song Wars. The imperial court of the Southern Song dynasty (1127–1279) was then forced to acknowledge the Jurchen rulers of the Jin dynasty as their superiors. The Mongols conquered the Jin dynasty in 1234 with the aid of the Song dynasty, which itself was also conquered by the Mongol-led Yuan dynasty under Kublai Khan by 1279. With powerful dynasties to its north such as the Tangut-led Western Xia, the Song dynasty was forced to engage in skillful diplomacy. The famous statesmen and scientists Shen Kuo (1031–1095) and Su Song (1020–1101) were both sent as Song ambassadors to the Liao dynasty in order to settle border disputes. Shen Kuo asserted the Song dynasty's rightful borders in the north by dredging up old archived court documents and signed agreements between the Song and Liao dynasties. Su Song asserted the Song dynasty's rightful borders in a similar way, only he used his extensive knowledge of cartography and maps to solve a heated border dispute. Chinese maritime trade increased dramatically during the Song dynasty, with the bustling seaport at Quanzhou taking the lead. Maritime trade abroad was augmented by a booming shipbuilding industry in Fujian province. It was also enhanced by an economic revolution in Song China and the presence of many wealthy, willing investors of maritime trade missions. There were several notable diplomatic missions sent to China from foreign countries during the Song dynasty. This included the embassy of Al-Hakim bi-Amr Allah of Fatimid Egypt to the court of Emperor Zhenzong in 1008, as well as the embassy of Emperor Kulothunga Chola I of the Imperial Indian Chola dynasty to the court of Emperor Shenzong in 1077. Although the golden age of Chinese Buddhism ended during the Tang dynasty, there were still influential Chinese Buddhist monks. This included the Zen Buddhist monk Wuzhun Shifan (1178–1249), who taught Japanese disciples such as Enni Ben'en (1201–1280). After returning to Japan from China, the latter contributed to the spread of Zen teaching in Japan and aided in the establishment of Tōfuku-ji. Yuan dynasty The Yuan dynasty (1271–1368) of China was the easternmost part of the vast Mongol Empire (stretching from East Asia to Eastern Europe), which became politically separated