 In 405, according to Rutilius Namatianus, "De Reditu" 51–60, Stilicho ordered the destruction of the Sibylline Books.The reasons for this are unknown, and the story cannot be verified.In late 406, Stilicho demanded the return of the eastern half of Illyricum (which had been transferred to the administrative control of Constantinople by Theodosius), threatening war if the Eastern Roman Empire resisted.