Isabella has made few fictional appearances, but she is a major character in Graham Shelby's "The Knights of Dark Renown" (1969) and its sequel "The Kings of Vain Intent" (1970). Shelby idealises her marriage to Humphrey, depicting them as his young romantic leads. He then goes on to depict her being beaten and raped by Conrad in a sadistically abusive relationship. This sensationalist depiction is not supported by any evidence. Shelby implies that Isabella plotted Conrad's murder in revenge for his abuse, and depicts her as mentally numbed and indifferent to Henry.