Ekthesis (Admonitory Chapters for Emperor Justinian)
Ἔκθεσις κεφαλαίων παραινετικῶν
Βασιλεύς τιμῇ μὲν ἰσόθεος, δυνάμει δὲ ὡς θνητός· κοινωνός ἐστιν ἀνθρώπων.
Our renderingThe emperor is in honor equal to God, but in power mortal; he is a fellow-member with humanity.
What it is
Composed by Agapetus, deacon of the Great Church (Megale Ekklesia) at Constantinople, and addressed to Emperor Justinian around 527–530, this text of seventy-two short aphoristic chapters is a landmark of Christian political theology. Its seventy-two initial letters form a Greek acrostic dedicating the work to Justinian—a tour de force of literary craft embedding a prayer of submission within the very structure of the text. Agapetus drew on Isocrates, Basil the Great, and Gregory of Nazianzus to insist that the emperor is obligated to imitate God in his moral governance and to display philanthropia toward his subjects. Over eighty manuscripts survive; the text was read in Byzantine schools for centuries and influenced Western mirrors as well. Note: the 'Great Church' designation refers to the pre-Justinianic cathedral on the same site; the current Hagia Sophia building dates from 532–537.
Why it still matters
Though a political treatise rather than a prayer, its seventy-two brief aphorisms on the moral obligations of power are well suited to a daily reading practice; one chapter per day across seventy-two days forms a complete cycle of meditation on how any Christian in authority—from parent to employer—is called to imitate divine justice and mercy.
Kept alongside
De consideratione (On Consideration)
De consideratione ad Eugenium papam
Five books of spiritual and pastoral counsel addressed personally to Pope Eugenius III, himself a Cistercian monk trained under Bernard, written between 1148 and 1152. It functions simultaneously as a mirror for the supreme ruler and as a manual of contemplative self-examination, warning against the tyranny of busyness and calling the highest officeholder back to inner recollection. A manuscript copy dated c. 1465 survives at the University of Chicago; the work was widely read by reform-minded clergy and rulers who circulated it as a model for Christian governance. Bernard addressed it directly to a head of state with whom he had a personal, documented formation relationship.
Epistola aurea / Epistola ad fratres de Monte Dei (The Golden Epistle)
Epistola ad fratres de Monte Dei
William of Saint-Thierry's final work, addressed to the newly founded Charterhouse of Mont-Dieu near Reims, is a complete map of the spiritual life from the animal man, through the rational man, to the spiritual man, structured as a pastoral letter of extraordinary warmth. Called 'Golden' by Mabillon in 1690, it circulated for centuries under the name of Bernard of Clairvaux, which secured it an even wider audience in royal and noble households. It was 'cherished by monks, beguines, and lay folk for eight centuries' and survives in Latin, Middle High German, Old French, Alemannic, and Middle Dutch translations, testifying to an aristocratic and lay reading audience that reached well beyond the cloister.
Admonitions (Libellus de institutione morum)
Libellus de institutione morum ad Emericum ducem
The Libellus de institutione morum, Hungary's foundational Mirror for Princes, was composed by a foreign cleric at King Stephen I's court as a formation letter addressed to his son and heir, Prince Emeric. Its ten short chapters cover Catholic faith, protection of the church, honour due to bishops, justice, hospitality to foreigners, wise counsel, prayer, fasting, and the cultivation of virtue and mercy. The text served for centuries as the opening document of the Corpus Juris Hungarici and defined the spiritual obligations of the Christian king for all subsequent Arpad and Anjou heirs. As the first major Latin prose work produced in the Kingdom of Hungary, it survives only in 15th–16th-century codex copies; its original title is unknown.