Lü Dongbin

Lü Dongbin (Chinese: 呂洞賓; Wade–Giles: Lü Tung-Pin; born 796) was a Tang Dynasty Chinese scholar and poet who has been elevated to the status of an immortal in the Chinese cultural sphere, worshipped especially by the Taoists. Lü is one of the most widely known of the group of deities known as the Eight Immortals and considered by some to be the de facto leader. (The formal leader is more likely said to be Zhongli Quan or sometimes Iron-Crutch Li.) He is also a historical figure who was mentioned in the official history book History of Song. Lü is widely considered to be one of the earliest masters of the tradition of neidan, or internal alchemy. He is depicted in art as being dressed as a scholar and he often bears a sword on his back that dispels evil spirits.

Lü Dongbin is usually portrayed as a scholarly, clever man with a genuine desire to help people obtain wisdom/enlightenment and to learn the Tao. However, he is often portrayed as having some character "flaws", not an uncommon theme for the colorful Taoist immortals, all of whom in general have various eccentricities:

His name is Lü Yán, with Yán (巖 or 岩 or 喦) being the given name. Dòngbīn is his courtesy name. He is called Master Pure-Yang (純陽子 Chunyang Zi), and is also called Lü the Progenitor (呂祖 lü zŭ) by some Daoist, especially those of the Quanzhen School. He was born in Jingzhao Prefecture (京兆府 Jīngzhào Fŭ) around 796 CE during the Tang Dynasty.

When he was born, a fragrance allegedly filled the room. His birthday is said to be on the fourteenth day of the fourth month of the Chinese calendar. He had been very intelligent since childhood and had many academic achievements. However, according to one story, still unmarried by the age of 20, Lü twice took the top-level civil service exam to become a government official, but did not succeed.

...
Wikipedia