The article discusses in detail the testimony of the sixth-century Neoplatonic commentator Eutocius about the original redaction of his commentary to Apollonius’ Conica in the form of a corpus of scholia contained in the margins of his own edition of the treatise. The discussion includes a careful analysis of thecodicological and paleographical issues related to the fact that this commentary has been transmitted as a text independent from Apollonius’ Conica. To place Eutocius’ writing in context, I present the manifold forms of ancient mathematical
commentaries and the main authors involved: Hero, Serenus, Pappus, Theon,Proclus, Eutocius himself
in Archimedem, and Simplicius.