a government official who has been demoted and exiled to a remote location

他身居边陲，以谪仙自比，心中尽是报国无门的悲愤。

an immortal banished from heaven to live on earth; an epithet used for exceptional individuals, notably the Tang poet Li Bai

世人皆称李白为“谪仙人”，赞其诗才旷古绝伦。