An Daoquan

Basing his medical practice in Jiankang Prefecture (present-day Nanjing, Jiangsu), An Daoquan is nicknamed "Divine Phyisican" as he could cure critical illnesses. He is often compared to the legendary Han dynasty physician Hua Tuo.

When Song Jiang is attacking Daming Prefecture (大名府; present-day Daming County, Hebei) with a force to rescue Lu Junyi and Shi Xiu, who are incarcerated, he suddenly falls very ill with a tumour on his back. A fever comes on and never subsides, causing him to fall into delirium. Back in Liangshan with the force withdrawn, Song continues to be bedridden, with his condition deteriorating and all medicines to no avail. Zhang Shun, who grew up in the Yangtze region, remembers that once his mother suffered from a similar illness and was healed by An Daoquan. He volunteers to find An in Jiankang and bring him to Liangshan.

Zhang Shun comes to the Yangtze and boards the boat of the pirate Zhang Wang. Midway across the river, Zhang Wang pounces on him when he is asleep, ties him up and throws him into the river. An excellent swimmer, Zhang Shun frees himself under water and gets to the opposite bank, where he finds the inn of Wang Dingliu. Wang's father provides him dry clothes and lodgings and introduces his son to him saying the young man wishes to join Liangshan. Zhang Shun however has to go to Jiankang first to get An Daoquan.

Zhang Shun finds An Daoquan but the physician is unwilling to leave a prostitute called Li Qiaonu whom he is besotted with. Just when Zhang is wondering how to get An to Liangshan, he discovers Li is also patronised by Zhang Wang, who visits the woman one night when An is drunk at her place. Zhang Shun budges in and kills Li when the two are making out but Zhang Wang gets away. Remembering what Wu Song did in Mengzhou, Zhang Shun writes with the blood of Li on the wall a proclamation attributed to An declaring himself to be the killer. When An recovers from his stupour, he has no choice but to go with Zhang Shun to Liangshan.

At Wang Dingliu's inn, Zhang Shun plots with the young man to get back his own on Zhang Wang. Wang Dingliu finds Zhang Wang and hires him as their ferryman. When the boat is midstream, Zhang Shun, who has been hiding his face, overcomes the boatman with the help of Wang Dingliu, ties him up and dumps him into the river. Wang follows Zhang Shun and An Daoquan to Liangshan, where the physician cures Song Jiang of his life-threatening illness.

An Daoquan is appointed as Liangshan's physician after the 108 Stars of Destiny came together in what is called the Grand Assembly. He participates in the campaigns against the Liao invaders and rebel forces in Song territory following amnesty from Emperor Huizong for Liangshan.

Just before the battle of Hangzhou in the campaign against Fang La, Emperor Huizong summons An Daoquan to the imperial capital Dongjing (東京; present-day Kaifeng, Henan) because he is down with a minor illness. After that An is retained in the palace where he is appointed as an imperial physician.

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