A text (with apparatus criticus), translation, and commentary, with introduction, of the first book of Valerius Flaccus' Argonautica, an unfinished Roman epic extending to eight books and several thousand lines, written in the Flavian period (69-96 CE). The commentary addresses both textual and semantic matters and broader questions of stylistics, poetics, thematics, and cultural context. Particularly close attention is paid to Valerius' choice of diction, his sophisticated use of figures and tropes, his often sly erudition, the recurring and strategic resort to subtle intertextual gestures, and, where appropriate, the reception of his work in later authors. The substantial introduction provides an overview of the poet and his poem.