The "Theology in a Thousand Verses", written by Leon Magistros Choirosphaktes, an outstanding tenth-century Byzantine diplomat, is a philosophical and theological didactic poem addressed to a young emperor (perhaps Constantine VII Porphyrogenitus). The main objective of the present edition is to provide a linguistically accessible text. Handed down in a single manuscript (Vat.gr.1257) under inauspicious conditions, the poem had been hidden away to this day and is printed here in its entirety for the first time since its creation some ten centuries ago. It is accompanied in this book by a translation and a commentary intended primarily to clarify the inherently difficult and sometimes obscure text. The volume also includes four indexes.