idiographus
From LSJ
οὗτος μὲν ὁ πιθανώτερος τῶν λόγων εἴρηται, δεῖ δὲ καὶ τὸν ἧσσον πιθανόν, ἐπεί γε δὴ λέγεται, ῥηθῆναι → this is the most credible of the stories told; but I must relate the less credible tale also, since they tell it
Latin > English (Lewis & Short)
ĭdĭŏgrăphus: a, um, adj., =ἰδιόγραφος>,
I written with one's own hand: liber Vergilii, autograph, Gell. 9, 14, 7.