 Xi Zuochi may have suffered a stroke at this time, contributing to his difficulty walking later in life.While in quasi-banishment in the deep south, Xi Zuochi composed his greatest work, "The Annals of Han and Jin" ("漢晉春秋"), in 54 fascicles.Intended as a corrective against Huan Wen's increasingly undeserved imperial ambitions, Xi Zuochi took the inventive and iconoclastic step of delegitimating the Wei dynasty, theorising that ritual abdication alone was not enough to establish a legitimate dynasty with a true mandate.