This chapter proposes an assessment of the biblical figure of David as presented by Theodore Prodromos in some of his Historical Poems. David was often considered in Byzantine culture as the first and most important example of a Christian poet. The poet of the Psalms is depicted by Prodromos both as a source of inspiration for the persona loquens and as a role model for the emperor. This twofold representation is crucial to shed light on some of the poetic strategies used by Prodromos when dealing with Psalmic material in poems addressed to emperors. The chapter includes a close-reading of Prodromos’ Historical Poem 17, where a military victory of John II Komnenos is celebrated. In this long text, Prodromos systematically borrows verses from the text of the Psalms and adapts them in order to fit the occasional character of the poem. The analysis of the biblical hypotext as a literary source presented in the chapter provides new insight into the role that the biblical heritage could play within Byzantine authors’ canonical reference system.