Since Antiquity, Lycophron has had an exemplary status in the canon of obscure authors. In order to lay the basis for a new study of "Lycophronic obscurity" - which is rooted in the history of the text's reception and transmission, but also matches the poetic occultation deliberately practiced by this author -, this paper offers a methodical list of the ancient testimonies, together with a translation and a commentary. The relevant passages are distributed into three sections: the first one gives an overview of the references and judgments found outside the Scholia to Lycophron; the second one contains the observations we can read in the latter corpus (comprising the ancient scholia and the commentaries written by John Tzetzes in the 12th century); the testimonies pertaining to the obscurity of the "Alexandra" are gathered in the third section. This inquiry advances our understanding of the modes of interpretation, the analytic categories and the terminology which were put to use; it also reveals that our sources have nothing to say on certain aspects of the poem.