[b] As a result, he acquired the additional nickname (βιβλιολάθας, biblioláthas), meaning "Book-Forgetting" or "Book-forgetter", a term coined by Demetrius of Troezen.
The Aristophanes scholia also cite him often, and he is known to have written treatises on Euripides, Ion, Phrynichus's Kronos,[7] Cratinus, Menander,[8] and many of the Greek orators including Demosthenes, Aeschines, Isaeus, Hypereides and Deinarchus.
[17] The Stoic philosopher Seneca, in his Epistulae Morales ad Lucilium, claims that Didymus wrote 4,000 books, while making a commentary on the acquisition of useless knowledge.
Further insight into Didymus' methods of writing was provided by the discovery of a papyrus fragment of his commentary on the Philippics of Demosthenes.
This confirms that he was not an original researcher, but a scrupulous compiler who made many quotations from earlier writers, and who was prepared to comment about chronology and history, as well as rhetoric and style.