Qiu Chuji, courtesy name Tongmi (通密), also known by his Taoist name Master Changchun, was a renowned Taoist master from late Southern Song/Jin dynasty and a famous disciple of Wang Chongyang, the founder of Quanzhen School. He is known for being invited by Genghis Khan to a personal meeting near the Hindu Kush, who also respected and honored him as an Immortal.