Hippocrates and Dioscorides: ancient medicine in later manuscripts
Greek medical works survive through Byzantine manuscripts. A copy’s date tells us when it was made, not when the text first appeared.

What the Āryabhaṭīya edition shows
A historical study of the origin of the Corpus Hippocraticum emphasizes that the Hippocratic works circulated in separate rolls and groups until they were compiled into Byzantine codices. The research record uses this to model composition versus witness: the corpus has many authors and no single composition date. PubMed-indexed historical study ↗
A manuscript as an object
The Vienna Dioscorides, Codex Vindobonensis Med. gr. 1, is a Byzantine manuscript of Dioscorides' pharmacological work; a historical study examines its alphabetical organization of plants and remedies. The record treats the codex as a witness object, not as the date of the original work. PubMed-indexed historical study ↗
How old is the copy you have?
For any ancient text, write two dates: the estimated composition and the date of the oldest surviving copy. If they are centuries apart, ask what happened in between: copying, rearrangement, translation, loss.
Ancient passage or later addition?
If the earliest complete copy of a text is Byzantine, what kinds of evidence could still show that a passage is ancient rather than a later addition?