Through the work of classical writers such as Plutarch, knowledge of the Osiris myth was preserved even after the middle of the first millennium AD, when Egyptian religion ceased to exist and knowledge of the writing systems that were originally used to record the myth were lost.
Berkat karya para penulis klasik seperti Plutarch, pengetahuan tentang mitos Osiris dilestarikan bahkan setelah pertengahan milenium pertama Masehi, ketika agama Mesir telah lenyap dan pengetahuan tentang sistem penulisan yang semula digunakan untuk merekam mitos tersebut hilang.