Diodore of Tarsus presided over the Antiochene school of interpretation in its heyday. In his sole surviving exegetical work on the Old Testament he formulated the principles of interpreting Scripture taught in that school. Available here for the first time in English is Diodores commentary on Psalms 151, with Robert C. Hills insightful notes on Diodores exegesis of the Psalter. It was from their mentor Diodore that later Antiochenes Chrysostom, Theodore, and Theodoret derived the distinctive principles underlying the theology that figured prominently in debate and controversy in the fourth and fifth centuries. Patristic scholars and students of the Psalms look to the approach of the great Eastern commentators as an important development in the history of exegesis, Christology, morality and spirituality and will find this translation an invaluable asset.