Zhang Daoling
The importance of the Zhengyi school grew during the Song dynasty, with the Celestial masters frequently receiving imperial appointments. In 1239, the Southern Song dynasty's Emperor Lizong commanded the 35th Celestial Master Zhang Keda to unite the Lingbao School, the Shangqing School and Zhengyi Dao. The new school was to retain the Zhengyi name and remain based at Mount Longhu. Shortly after the schools were united, the Mongols under Kublai Khan conquered the Southern Song dynasty and established the Yuan dynasty in China. He accepted the claim that the Celestial Master of Mount Longhu was descended from Zhang Daoling and granted the school the right to control affairs relating to Daoism in the Jiangnan area. In 1304, as a result of Zhengyi Dao's increased importance under the Mongols, all of the Daoist schools, with the exception of the Quanzhen School, were united under the banner of the Zhengyi School, with the 38th Celestial Master, Zhang Yucai, as leader.