Historical figures who appear in Jin Yong's wuxia novels generally receive generous treatment from the author: the various rulers of nation-states such as Dali, the Liao Empire, the Yuan Dynasty, the Qing Dynasty, etc., are often portrayed in a flattering light...in some cases coming off looking much better than their historical, real world counterparts.
Which historical figures in Jin Yong's stories, however, do you feel that he unfairly maligned? Is there any historical wuxia character whom you felt that Jin Yong might have slandered or treated unfairly?
For me, it's the Cheun Jen Sect Taoists: Jin Yong's portrayal of the Eternal Springs Taoist Yau Chui Gei in LOCH and ROCH was often unflattering, and he maligned Yau's student Wan Tze Ping as a rapist in ROCH (something Jin Yong rectified in the third edition of the novel). Even Jin Yong's depiction of Cheun Jen Sect founder Central Divinity Wong Chung Yeung was highly unflattering in ROCH (WCY was portrayed fairly in LOCH, but ROCH introduced a bunch of retcons into his early years that seemed to besmirch the character).